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ICSE Class 10 Answered

A force of 100N acts on an object of mass 10kg for 9sec.If the object was initially moving with the speed of 10m/s,calculate the initial and final kinetic energy of the object.By what factor does the kinetic energy increase?  
Asked by joshi.krish888 | 09 Jan, 2019, 07:52: PM
answered-by-expert Expert Answer
Acceleration a = F/m = 100/10= 10ms-2
Final velocity v = u + at = 10+ 10×9= 10+90= 100ms-1
Initial kinetic energy= 0.5×mu2 
= 0.5× 10×10××10 =500J
Final kinetic energy = 0.5×mv2 
= 0.5×10×100×100= 50000J
Change in kinetic energy = 50000-500= 49500J
Answered by Ankit K | 09 Jan, 2019, 10:36: PM

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