A ball is thrown vertically upward with a speed of

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

Problem

A ball is thrown vertically upward with a speed of

28\,\text{m/s}

. After how much time will it again be exactly

30\,\text{m}

above the point of projection on its way down? (Take

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

.) (a)

1.43\,\text{s}

(b)

5.72\,\text{s}

(c)

4.29\,\text{s}

(d)

2.86\,\text{s}

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