The velocity of a car increase from
54 km/hr to 72 km/hr. How much is
the work done if the mass of the car
is 1500 kg ?
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The velocity of a car increases from 54km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500kg
☣ ANSWER ☣
Given values
Mass m = 1500 kg
U =54km/hr
= 54 X 5/18 = 15 m/s
V = 72 km/hr
= 72 X 5/18
=. 20 m/s
We know that
Work done = change in kinetic energy
So
1/2 m ( v² - u ²)
= 1/2 X 1500 ( 20² - 15² )
= 1/2 X 1500 ( 400 - 225 )
= 750 X 175
= 13125 J //
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