Question

A car is moving with spees 54 km/hr. After applying brakes comes at rest in 10 seconds.Calculate its retardation

Answer 1

Answer:

-1.5

Explanation:

v=0m/s (it comes to rest)  

u=54km/hr =15m/sec

t=10 sec

Retardation = v-u/t

0-15/10

- 15/10

- 1.5

Answer 2

Answer:

retardation=1.5m/s²

Explanation:

u= 54×5/18 m/s (firstly we will change km/h into m/s)

u=15m/s

t=10 sec

v= 0m/s (since the body comes to rest and is not moving)

a=v-u/t

a=0-15/10

a=-15/10

a=-3/2

a= -1.5m/s²

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since it's hidden in retardation

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