In the question number of 93, what is the velocity of a monkey running on the roof of the train A against its motion with a velocity of `18 km h^(-1)` with repect to the train A as observed by a man standing on the ground?

Options

A. `5 m s^(-1)`
B. `10 m s^(-1)`
C. `15 m s^(-1)`
D. `20 m s^(-1)`

Answer

B

Explanation

Let the velocity of the monkey with respect to ground be `v_MG`. Relative velocity of the monkey with respect to train A,
`v_(MA) = -18 km h^(-1) = -18 xx 5/18 m s^(-1) = -5 m s^(-1)`
`v_(MG) = v_(MA) + v_(AG) = -5 m s^(-1) + 15 m s^(-1) = 10 m s^(-1)`