A ball is thrown vertically upward from ground level

MATHEMATICS · Subjective · CBSE · Mathematics · Quadratic Equations · Quadratic Equations

Problem

A ball is thrown vertically upward from ground level. Its height (in metres) after tt seconds is given by h(t)=−5t2+20th(t)= -5t^{2}+20t. After how many seconds will the ball hit the ground again?

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