An elevator without a ceiling is ascending with a constant speed of 10 m//s. A boy on the
Channel: Doubtnut
Date: 2020-07-12

An elevator without a ceiling is ascending with a constant speed of 10 m//s. A boy on the elevator shoots a ball directly upward, from a height of 2.0 m above the elevator floor. At this time the elevator floor is 28 m above the ground. The initial speed of the ball with respect to the elevator is 20 m//s. (Take `g=9.8m//s^2`)  (a) What maximum height above the ground does the ball reach?  (b) How long does the ball take to return to the elevator floor?