motion under gravity

Asked by yasho1710 | 4th Sep, 2010, 08:26: AM

Expert Answer:

The question talks about two bodies of same mass being dropped through the same height. To find the final velocity of the second body, we will find the value of acceleration from the first case.
 
Body 1. Initial velocity, u = 0
           Final velocity, v = 3 km/h
            Height, h
           Using v2 = u2 + 2ah
                    32 = 0 + 2ah
                    a  = 9/(2h)
 
Body 2. Initial velocity, u = 4 km/h
           Final velocity, v = ?
            Height, h
           Using v2 = u2 + 2ah
                    v2 = 42 + 2ah
                    v2 = 16 + 2(9/2h)h
                        = 25
                    v =  5 km/h

Answered by  | 5th Sep, 2010, 12:02: AM

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