A ball is thrown vertically upward from ground level

MATHEMATICS · Single correct · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

A ball is thrown vertically upward from ground level. Its height (in metres) after

t

seconds is given by

h(t)=-t^{2}+5t+14

. After how many seconds will the ball hit the ground again? (a)

5\,\text{s}

(b)

2.5\,\text{s}

(c)

7\,\text{s}

(d)

2\,\text{s}