Question

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 ?​

Answer 1

DATA:
Initial Velocity: 54 km/h
=54X1000/3600=15m/s
Final Velocity:72 km/h
=72X1000/3600=20m/s
Mass=1500 kg
SOLUTION:
To Find Acceleration:
a=vf-vi/t
=20 X 15/1
=300m/s^2

Hence Force Is The Product Of Mass And Acceleration
F=ma
F=1500 X 300
F=450000 N

To Find Work:
W=Fd

To Find distance:
According to 3rd equation of motion,
2aS=vf^2 -vi^2
2(300)S= (20)^2 - (15)^2
600 S= 400 X 225
600 S= 90000
S= 90000/600
S=150 m

To Find Work:
W= Fd
W=450000 X 150
W=67,500,000 J

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