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Q.

Find the odd one from the below-given options.


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a

Pulling a cart

b

Stretching a coiled string

c

Kicking a football

d

Weight of the body 

answer is D.

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Detailed Solution

The odd one from the below-given options is option 4.
Contact force is the force exerted by objects in contact with one another. The contact force acts on the two objects' point of direct contact. This force can be either continuous as a continuous force or momentary as an impulse. Newton's Laws govern contact force.
Here pulling a cart, stretching a coiled string and kicking a football are contact forces.
A non-contact force is a force which acts on an object without approaching physically in contact with it.
Here the weight of the body is a non-contact force.
 
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