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8.A boy standing at the top of a tower of 20 m heightdrops a stone. Assuming g 10 m/s, the velocitywith which it hits the ground is AIPMT 2011)(1) 10.0 m/s(3) 40.0 m/s(2) 20.0 m/s(4) 5.0 m/s

Answer»

h=20m

g=10m/s^2

u=0

v^2-u^2 = 2gh

v^2-0=2*10*20

v = 20 m/s^2



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