A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively

Options

A. g.g
B. g-a,g-a
C. g-a,g
D. a,g

Answer

C

Explanation

For the man standin in the lef, the acceleration of the ball
`veca_(bm)= veca_(b)- veca_(m) rArr a_(bm)=g-a`
where .a. is the acceleration of the mass (because the acceleration of the lift is .a.)
for the man standing on the ground, the acceleration of the ball
`veca_(bm)= veca_(b)- veca_(m) rArr veca_(bm)=g-0=g`