A ball is thrown vertically upwards from the top of a tower with velocity 20 m/s . The height of the tower is 25 m. Find the time taken by the ball to reach the ground
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total time of flight, t is obtained by solving this quadratic equation
h= -ut+ 1/2gt²
25= -20t+1/2×10×t²
t²-4t-5=0
t=5s
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