CLASS WORK
1. A boy of weight, 300N climb's to the top of a hill of weight 20 m. The work done by the boy against the force of gravity is:
2. A body initially at rest is accelerated at the rate of 0.2 metre per seconds square for 5seconds under a constant force of 50N.the work done on the body is
3. An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is:
Answers
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5
Answer:
1.
work done will be change in potential
W = mgh = 300 × 20 = 6000 J = 6 kJ
2.
First find distance travelled by boy
Now
W = F . S = 50 × 2.5 = 125 J
3.
Assume potential energy is zero at ground .
KE = PE = mgh = 20 × 10 × 10 = 2 kJ
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0
Answer:
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