Question

2. A block of mass 1 kg is thrown from the surface of the
earth with the speed of 10 m/s. Find the work done by the
gravitational force during vertical motion of the body.
(g = 10 m/s2)
Ans. -50 J

Answer 1

Answer:

Given, massofball,m=1kg;g=10m/s

2

Force of gravity on the ball,

F=mg=1×10=10N

Vertical displacement of the ball, s=4m

Since the force and the displacement of the ball are in opposite directions, work done by the force of gravity,

W=−F×s

=−10×4=−40J

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