A body is moving with velocity 30 m s⁻¹ westward. After 10 s its velocity becomes 40 m s⁻¹ northward. The average acceleration is:
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A body is moving with velocity 30 m s⁻¹ westward. After 10 s its velocity becomes 40 m s⁻¹ northward. The average acceleration is:

G1 Physics · Accepted Answer

Step 1: Take east as +x and north as +y. Initial velocity is -30i m s⁻¹ and final velocity is +40j m s⁻¹. Step 2: Δv = 30i + 40j, whose magnitude is 50 m s⁻¹. Step 3: Average acceleration magnitude = |Δv|/Δt = 50/10 = 5 m s⁻². Final answer: C.