A stone of mass 1kg is dropped from a height of 500m. How much time does the stone take to hit the ground.
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Answer: use the second equation of motion
s=ut+1/2at2
s=1/2at2
500=1/2*10*t2
500=5t2
t2=500/5=100
t=root over 100=10 sec
Explanation:
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