ICSE Class 10 Answered
A body of mass 20 kg falls from a height of 78.4 m to the ground and rebounds to a height of 19.6 M if the ball made contact with the ground for one fifth of a second hand force in KGF exerted by the ground on the body
Asked by Samrat | 30 Jun, 2018, 09:12: PM
Expert Answer
velocity v1 of the body when it reaches ground, v1 =
Rebound velocity V2 for the body to reach a height 19.6 m, v2 =
force =
( velocities are in opposite direction. hence change in momentum is calculated as m(v1+v2) )
Answered by Thiyagarajan K | 02 Jul, 2018, 12:29: PM
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