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An automobile travelling with a speed 6...

An automobile travelling with a speed `60 km//h` , can brake to stop within a distance of `20 m` . If the car is going twice as fast i. e. , `120 km//h`, the stopping distance will be

A

20 m

B

40 m

C

60 m

D

80 m

Text Solution

Verified by Experts

The correct Answer is:
D
The stopping distance , `S prop u^(2) " " ( :. v^(2)=u^(2)-2as)`
`rArr (S_(2))/(S_(1)) =((u_(2))/(u_(1)))^(2) =(120/60)^(2)=4`
`rArr S_(2)=4xxS_(1) = 4 xx 20 = 80 m `
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