Keeping the banking angle same, to increase the maximum speed with which a vehicle can travel on a curved road by I0 percent the radius of curvature of road has to be changed from 20 m to

Options

A. 6 m
B. 18 m
C. 24.2 m
D. 30.5

Explanation

Let `h_1`=Distance travelled by the wooden block
`h_1=ut+1/2g t^2`
`h_1=1/2g t^2" "( :'u=0)`
`h_2`= Distance travelled by the bullet
`h_2=ut-1/2g t^2`
`100t-1/2"gt"^2`
Given height of the cliff, `h=100m`
`h_1+h_2=100`
`1/2g t^2+100t-1/2g t^2=100`
`100t=100`
`:. t=1s`