In the following examples, a force is at play. Identify them and tell which force among them is different from others.
A
Pulling of a cart
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B
Stretching of a coiled spring
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C
Kicking of a football
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D
Working of an electrical water pump
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Solution
The correct option is D Working of an electrical water pump In each of the following examples, except D, the forces acting can be identified as a contact force. Electrical force is the only non-contact force among the options and hence is the odd one out.