A ball is projected vertically upward from the ground with a speed of

PHYSICS · Subjective · CBSE · Physics · Gravitation · Gravitation

Problem

20\,\text{m/s}

. (i) After how many seconds will it be

15\,\text{m}

above the ground for the first time? (ii) After how many seconds will it be at the same height again? Take

g = 10\,\text{m/s}^2