An elevator without a ceiling ascends at a constant speed of

PHYSICS · Multi-part · CBSE · Physics · Motion in a Straight Line · Motion in a Straight Line

Problem

10\,\text{m s}^{-1}

. A boy on the elevator shoots a ball vertically upward from a height of

2.0\,\text{m}

above the elevator floor. At that time, the elevator floor is

28\,\text{m}

above the ground. The initial speed of the ball relative to the elevator is

20\,\text{m s}^{-1}

. Take

g=9.8\,\text{m s}^{-2}

. (1) What maximum height above the ground does the ball reach? (2) How long does the ball take to return to the elevator floor?