A man is riding an elevator which is rising up with a uniform acceleration of `2 ms^(-1)` He tosses a coin vertically upwards with a speed of 20 ms. What time the coin would take to fall back into his hands?` (Take g = 10 ms^(-2))`

Options

A. `(20)/(2)sec`
B. `5.0sec`
C. `(10)/(3)sec`
D. `(5)/(3)sec`

Answer

c

Explanation

Here = `t=(2upsilon)/(g+a)=(2xx20)/(10+2)=(40)/(12)`
`=(10)/(3)`seconds
Hence (c) is the correct choice