A car starts from rest & after moving some distance d, it gains speed v then
A
Work done by friction on the car is negative.
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B
Work done by engine force on the car is negative
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C
Work done by normal force (between tyres & road) is zero.
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D
Work done by normal force (between tyres & road) is positive.
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Solution
The correct option is C Work done by normal force (between tyres & road) is zero. W=→F.→d or energy transferred WbyN=N.d = 0 Since there is no displacement in the direction of normal.