Question

A ball is thrown vertically upwards from the top of a tower with a velocity of 10ms1. The ball reaches the ground with the velocity 30 ms1. What is the height of the tower

Answer 1

a/eq of motion

v^2=u^2+2gh

10^2 =0^2+2×10×h

100 =20h

so , h=100/20

=5m

Answer 2

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