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 1500kg?
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w=change in k.e.=1/2*1500(20-15)
=750*5
=3750J
arya200079:
sry bro
converted velocity into m/s
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Answer:
Data : m = 1500 kg, u = 54 km/h
= 5400 m
_______ = 15 m/s,
3600s
v = 72 km/h = 72000m
_______ = 20m/s, W = ?
3600s
Work done,
W = increase in kinetic energy
= ½ mv² - ½ mu² = ½ m (v²-u²)
= ½ × 1500kg × [(20m/s)² - (15m/s)²]
= 750 × (400-225) J = 750×175 J
= 131250 J
The work done to increase the velocity of the car = 131250 J
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