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CBSE Class 9 Answered

A body of mass 2 kg is dropped from the top of a tower of height 50m.Acceleration due to gravity is 10m/s2. Calculate its kinetic energy at the end of 2 s.
Asked by sujaysarkar84 | 04 Mar, 2015, 06:32: PM
answered-by-expert Expert Answer

begin mathsize 14px style Hi space Sujay comma The space velocity space of space the space body space after space 2 space straight s space is straight v equals straight u plus at equals 0 plus 10 cross times 2 equals 20 space straight m divided by straight s So comma space kinetic space energy space after space the space end space of space 2 space seconds space is straight K equals 1 half mv squared equals 1 half cross times 2 cross times 20 squared equals 400 space straight J end style

Answered by | 04 Mar, 2015, 06:43: PM
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