A boy standing at the top of a 20-metre-high tower drops a stone. Assuming g = 10 $$m/ s^2$$ , the velocity with which the stone hits the ground is: ?->(Show Answer!)

1. A boy standing at the top of a 20-metre-high tower drops a stone. Assuming g = 10 $$m/ s^2$$ , the velocity with which the stone hits the ground is:

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