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A ball is thrown vertically upwards from...

A ball is thrown vertically upwards from the top of a building of height 29.4m and with an initial velocity 24.5 m/sec. If the height H of the ball from the ground level is given by `H = 29.4 + 24.5t - 4.9t^(2)`, then find the time taken by the ball to reach the ground.

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The correct Answer is:
it means in 6 seconds of time the ball reaches ground.
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