Question

A truck of mass 1.5 t is running speed of 54km/hr Find its KE, If the resistance to the motion is
100N. How far will the truck run before it stops?​

Answer 1

Answer:

4000

Given,

Mass , m = 1500 kg

Speed , v = 54 km/hr =

18

5

× 54 m/s = 15 m/s

The total kinetic energy of van is given by:

K=

2

1

mv²

K=

2

1

(1500)(15)²

K = 168750 J

or,

K = 40178.57 cal

So ,

loss in total energy of van = 40178.57 cal

Loss in energy per second =

10

40178.57

= 4017.8 cal/s

≈ 4000 cal/s

So, avrage production of energy is 4000 cal/s.