a particle is projected with speed 100m/s at an angle 60' with horizontal from the top of a tower. if the particle touches the ground after 4 sec.find (1)height of the tower(2)the position on the ground where it will strike the ground.
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Explanation:g means it gains velocity at the rate of 10 m/s per second.
So it hits the ground at 50 m/s
(or use v=u+at)
Average speed is 25 m/s, so in 5 seconds it falls 125 metres.
(or use s=t[u+v]/2 )
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