Question

A car moving with velocity 15 m/s comes to rest after 5 seconds. Calculate it's retardation.​

Answer 1

Answer:

v=15m/s

t=5sec

so, retardation = 15/5 = 3 m/s2

but retardation means decreasing in velocity with time ,

so your answer will be in negative 

therefore ,retardation = -3 m/s2

hope this help you.

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Answer 2

v/t= 15/5=3

hope u get ur ans