A constant force of 35 N is applied to an object of mass 22.0 kg at an angle of

Question

A constant force of 35 N is applied to an object of mass 22.0 kg at an angle of 22 degree with the horizontal. What is the work done by this force on the object if it causes a displacement of 2.5 m along the horizontal direction? 39 J 17 J 0 J 42 J -19 J A person applies a constant force on an object of mass 20 kg that cause the object to move horizontally at a constant speed of 0.25 m/s through a distance of 1.80 m. What is the work done on the object? 10 J 0 J 720 J 16 J Cannot be determined without knowing the magnitude of the applied force.

Explanation / Answer

From the given information,

As the object moves with constant speed, the net force acting on object is zero.

Net work done = Net force acting x distance travelled in direction of force

= 0 x 1.8 J

=0 J

so, option B is correct.

Note: Inorder to find work done by applied force, we need the magnitude of applied force. This work done is different from Net work done, which depends on net force acting on object.

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