A body is moving with velocity 30 m/s towards east. After 10 seconds its velocity becomes 40 m/s towards north. The average acceleration of the body is
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Solution
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Initial velocity u=30i^
Final velocity v=40j^
Change in velocity Δv=40j^−30i^
Magnitude ∣Δv∣=302+402=50
Average acceleration a=Δt∣Δv∣=1050=5m/s2
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