A stone is projected vertically upward with speed

PHYSICS · Single correct · CBSE · Physics · Gravitation · Gravitation

Problem

A stone is projected vertically upward with speed 20 m/s20\,\text{m/s}. Neglecting air resistance and taking g=9.8 m/s2g=9.8\,\text{m/s}^2, calculate its total time of flight before it returns to the point of projection. (a) 5.1 s5.1\,\text{s} (b) 4.0 s4.0\,\text{s} (c) 4.1 s4.1\,\text{s} (d) 2.0 s2.0\,\text{s}

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