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Standard IX

Physics

Types of Work

A block of ma...

Question

A block of mass 10 kg is released on a fixed wdge inside a cart which is moved with constant velocity 10 m/s towards right. Take initial velocity of block with respect to cart zero. Then work done by normal reaction (with respect to ground ) on block in two seconds will be: $(g = 10 m / s^{2})$ .

zero

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960 J

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1200 J

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none of these

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Solution

The correct option is A zero
Work done by normal reaction will be zero as there is 90 degree angle between the force and displacement.
so work done = $f . d c o s θ$
$N . d C o s 90 = 0$
hence (A) is correct answer

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Similar questions

Q. A block of mass 10 kg is released on a fixed wedge inside a cart which is moving with constant velocity 10

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A block of mass 10 kg is released on a fixed wdge inside a cart which is moved with constant velocity 10 m/s towards right. Take initial velocity of block with respect to cart zero. Then work done by normal reaction (with respect to ground ) on block in two seconds will be: (g=10m/s2).

The correct option is A zeroWork done by normal reaction will be zero as there is 90 degree angle between the force and displacement. so work done = f.dcosθ N.d Cos90=0 hence (A) is correct answer

A block of mass 10 kg is released on a fixed wdge inside a cart which is moved with constant velocity 10 m/s towards right. Take initial velocity of block with respect to cart zero. Then work done by normal reaction (with respect to ground ) on block in two seconds will be: $(g = 10 m / s^{2})$ .

The correct option is A zero
Work done by normal reaction will be zero as there is 90 degree angle between the force and displacement.
so work done = $f . d c o s θ$
$N . d C o s 90 = 0$
hence (A) is correct answer