Question

A ball of mass 100g moving with a speed of 72km per hour is hit by bat that changes its speed to 144km per hour.find the changes in kinetic energy of ball

Answer 1

Given,

m = 100g = 0.1 kg

u = 72 km/hr => 20 m/s

v = 144 m/s => 40 m/s                                          

ΔK.E = $\frac{1}{2}m( v^{2}- u^{2} )$  [ ΔK.E - change in kinetic energy ]

ΔK.E = $\frac{1}{2} 0.1(1600 - 400 )$

ΔK.E = $\frac{1}{2} 0.1 ( 1200)$

ΔK.E = 60 J

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Answer 2

Explanation:

60 J

72/144*100

=60 J .

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