A stone is dropped from height of 20m. How long will it take to reach the ground? What will be its speed when it hits the ground when (g=10m/s2
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initial velocity is zero so s=1/2at^2
20=1/2(10)t^2
t^2=4
t=2sec
now let final velocity is v
v=u+at
v=0+10*2=20m/s
20=1/2(10)t^2
t^2=4
t=2sec
now let final velocity is v
v=u+at
v=0+10*2=20m/s
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