A moving train is stopped by applying brakes. It stops after travelling `80 m`. If the speed of the train is doubled and retardation remain the same, it will cover a distance-

Options

A. Same as earlier
B. Double the distance covered earlier
C. Four times the distance covered earlier
D. Half the distance covered earlier

Answer

C

Explanation

`0^(2)=u^(2)-2ax`
`((u_(1))/(u_(2)))^(2)=(x_(1))/(x_(2))`
`x_(2)=4xx x_(1)`