Kinetic Energy & Work-Energy Theorem questions with solutions

Showing 1–10 of 104 questions

• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  A block is sliding down on an inclined plane of slope θ and at an instant t = 0 this block is given an upward momentum so that it starts moving up on the inclined surface with velocity u. The distance (S) travelled by the block before its velocity become zero, is______.

  (g = gravitational acceleration)

  Options

  • Option A

    u²/(4g sinθ)

  • Option B

    2u²/(g cosθ)

  • Option C

    u²/(√2 g cosθ)

  • Option D

    u²/(2g cosθ)

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• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  A block of mass m is hung vertically from an elastic thread of force constant mg/a. Initially the thread was at its natural length and the block is allowed to fall freely. The kinetic energy of the block when it passes through the equilibrium position will be :

  Options

  • Option A

    mga

  • Option B

    mga/2

  • Option C

    zero

  • Option D

    2mga

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• MCQeasyWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  A body of mass 0.5 kg moves in a straight line with v=a $x^{\frac32}$ where a=5 m⁻¹ᐟ² s⁻¹. The work done by the net force as it moves from x=0 to x=2 m is:

  Options

  • Option A

    1.5 J

  • Option B

    50 J

  • Option C

    10 J

  • Option D

    100 J

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• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  A body of mass (5 ± 0.5) kg moves with speed (20 ± 0.4) m s⁻¹. Its kinetic energy is:

  Options

  • Option A

    (1000 ± 140) J

  • Option B

    (500 ± 140) J

  • Option C

    (500 ± 0.14) J

  • Option D

    (1000 ± 0.14) J

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• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  A particle initially at rest explodes into masses m₁ and m₂ moving in opposite directions at speeds v₁ and v₂. Find ratio of kinetic energies E₁/E₂.

  Options

  • Option A

    m₂/m₁

  • Option B

    m₁/m₂

  • Option C

    1

  • Option D

    (m₁+m₂)/(m₁m₂)

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• Multi-correctmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  For a non-relativistic particle of mass m, K = p²/(2m). Which statements are correct?

  Select all that apply

  • Option A

    If momentum magnitude doubles, kinetic energy becomes four times

  • Option B

    Two bodies having equal momentum necessarily have equal kinetic energy

  • Option C

    For fixed momentum, the smaller mass has greater kinetic energy

  • Option D

    For fixed kinetic energy, the larger mass has greater momentum magnitude

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• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  If momentum of a body increases by 50%, find percentage increase in kinetic energy.

  Options

  • Option A

    50%

  • Option B

    100%

  • Option C

    125%

  • Option D

    200%

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  AIPMT 1995NEET

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• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  An object moves horizontally with initial kinetic energy 10 J and displacement 3î m under force F = (-2î + 3ĵ) N. Its final kinetic energy is:

  Options

  • Option A

    10 J

  • Option B

    16 J

  • Option C

    4 J

  • Option D

    6 J

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• MCQmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  A 1 kg block moving at 6 m/s on a smooth horizontal surface compresses an ideal spring of force constant 200 N/m. Maximum compression is:

  Options

  • Option A

    0.30 m

  • Option B

    3/√50 m

  • Option C

    0.50 m

  • Option D

    3/5 m

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• NumericmediumWork , Power and EnergyKinetic Energy & Work-Energy Theorem

  A block of mass 1 kg is attached to a spring with a force constant 100 N/m and rests on a rough horizontal ground as shown in the figure. Initial displacement of block from natural length is 50 cm. The total distance (in m) covered by the block if coefficient of friction between block and ground is 0.05. [g =10 m/s²]

  

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