if a ball dropped from a tower falls down for 3s before hitting the ground ,find the height of the tower . also find the final velocity of the ball.
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u=0
a= 9.8
t= 3s
s= ut + 1/2× at^2
= 0 + 1/2 × 9.8 × 3×3
= 4.9 × 9
s = 44.1 m
v = u + at = 0 + 9.8×3 = 29.4 m/s
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