A 1000 kg car moves on a horizontal road at 20 m/s against a constant resistive force of 500 N. If the engine power is 30 kW, its instantaneous acceleration is N/20 m/s². Find N.
Physics · Work , Power and Energy · Power
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Question

A 1000 kg car moves on a horizontal road at 20 m/s against a constant resistive force of 500 N. If the engine power is 30 kW, its instantaneous acceleration is N/20 m/s². Find N.

G1 Physics · Accepted Answer

Driving force = P/v = 30000/20 = 1500 N. Net force = 1500−500=1000 N. Thus a=1000/1000=1 m/s² = 20/20 m/s², so N=20.