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Question

A block of mass 10kg is released on a fixed wedge inside a cart which is moved with constant velocity 10 ms−1 towards right. There is no relative motion between block and cart. Then work done by normal reaction on block in two seconds from ground frame will be (g=10 ms−2):
117433.jpg

A
1320J
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B
960J
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C
1200J
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D
240J
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Solution

The correct option is B 960J

Constant velocity means net force =0
Using Lami's theorem in the figure,
We have,

Nsin(180o53o)=100sin90o

N=100sin53o=80N

Now, WN=NScos53o

=(80)(20)(0.6)

=960J

133655_117433_ans.jpg

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