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A car travelling at a speed of 30 km/hou...

A car travelling at a speed of 30 km/hour is brought to a halt in 8 m by applying brakes. If the same car is travelling at 60 km/hour, it can be brought to a halt with the same braking force in

A

32m

B

18m

C

16m

D

2m

Text Solution

Verified by Experts

The correct Answer is:
A
The two balls are dropped from the same height simultaneously. Hence they will have the same velocity. After a fall of 30 feet i.e., `v_(1)=v_(2)`
`K_(1)/K_(2)=((1)/(2)m_(!)v^(2))/((1)/(2)m_(2)v^(2))=m_(1)/m_(2)=2/4=1/2`
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