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CBSE Class 10 Answered

A ball of mass 0.5 kg slows down from a speed of 5 m/s to 3 m/s.Calculate the change of kinetic energy of the ball? 
Asked by nishasaumitya | 03 Nov, 2018, 13:50: PM
answered-by-expert Expert Answer
Change in Kinetic Energy = begin mathsize 12px style 1 half m open parentheses v subscript f superscript 2 space minus v subscript i superscript 2 space close parentheses end style.....................(1)
where m is mass of ball, vf is final speed and vi is initial speed.
 
we have vf = 3 m/s   and vi = 5 m/s
 
Change in Kinetic Energy = (1/2)×0.5×(32 - 52) = -4 J
hence Kinetic energy decreases by 4 J
Answered by Thiyagarajan K | 03 Nov, 2018, 22:00: PM

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