Question

An object of mass 5 kg is acted upon by a force that varies with the position of the object
as shown in Fig. If the object start out from rest at a point x = 0, then its speed at x = 25 m is
Force (In N)
25
50
Position (In m)​

Answer 1

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When a force F acts on an object to displace it through a distance S in its direction,

then the work done W on the body by the force is given by:

Work done = Force × Displacement

W = F × S

Where,

F = 7 N

S = 8 m

Therefore, work done, W = 7 × 8

= 56 Nm

= 56 J

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