Question

Example 11.4 What is the work to be done
Ao increase the velocity of a car from
30 km h' to 60 km h' if the mass of
the car is 1500 kg?
Solution:
Mass of the car, m =1500 kg,
initial velocity of car, u = 30 km h'
30 x 1000 m
V=
60 X 60s
V=25/3 m s.
Similarly, the final velocity of the car,
U = 60 km hl
= 50/3 ms.
Therefore, the initial kinetic energy of
the car,
1
Ex= - me
2
x1500 kg x (25/3 m s !)2
m
2
= 156250/3J.
The final kinetic energy of the car,
Eus
1
x 1500 kg x (50/3 m s-)2
2
= 625000/3 J.
Thus, the work done = Change in
kinetic energy
Ekr Ek
156250 J.
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