A stone is thrown with a horizontyal velocity of 20m/s from the top of a cliff 15m high. Air resistance in negligible. For this stone, the time taken to fall 15m is 0.75s.
Calculate the magnitude of resultant velocity after falling 15m.

Question

A stone is thrown with a horizontyal velocity of 20m/s from the top of a cliff 15m high. Air resistance in negligible. For this stone, the time taken to fall 15m is 0.75s. 
Calculate the magnitude of resultant velocity after falling 15m.

anonymous · Answer

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anonymous · Answer

@emcrazy14  u can use the free fall formula..,
v^2 = u^2 + 2gh
where u is initial speed, v is the final speed, g is acceleration of gravity..., and h is high..,

anonymous · Answer

the time for the free fall equal to time the ball is thrown horizontally to the ground

anonymous · Answer

Ok. My answer is 26.3 m/s. But what I didnot understand is that after falling 15m, it hits the ground. So shouldn't the velocity be zero?

anonymous · Answer

No..., no zero.., you have to find the speed shortly before on the ground..,

anonymous · Answer

Okay. Thank you! :)

anonymous · Answer

ur welcome :)