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A body moving vertically upwards chnges its velocity at constant rate of from 50m/s to 20m/s in 3sec. What is its retardation .(Help me with Processes)

Answer» TAKE THE FINAL VELOCITY AS=20M/S(V)
TAKE THE INITIAL VELOCITY AS=50M/S(U)
TIME=3 SECONDS
NOW USE THE EQUATION V=U+AT
IN THIS CASE ACCELERATION=RETARDATION
20=50+3A
A=-30/3=-10M/S2





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