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Class 9 Chapter Work and energy Solved Numerical problems …
As final velocity = 0. Because change in KE = Kf−Ki = 1200 J Therefore, F × d = 1200. (where F is the average force) F=1200 / 2 ×10^−2 = 6×10^4N. The kinetic energy is eventually converted to heat energy. 24. The power of a heart which beats 72 times in a minute is 1.2kW. Calculate the work done by heart for each beat. ( 1 kJ)
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