A boy throws up a ball vertically insided an elevator, with a velocity of 10 m/s relative to the elevator. It takes 1 second for the ball to reach the hand of the boy. The acceleration of the elevator, taking `= 10 m//s^(2)`, is:

Options

A. zero
B. `10 m//s^(2)`
C. `30 m//s^(2)`
D. `20 m//s^(2)`

Answer

B

Explanation

Since, `T = (2v_(0))/(a_("net"))`
`a_("net") = 20 m//s^(2)`
Hence, `a_(E) = 10 m//s^(2)`