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Question

A 0.5 kg ball moving with a speed of 12m/s strikes a hard wall and return back with same velocity. Find change in momentum.

A
12 kg m/s
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B
20 kg m/s
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C
22 kg m/s
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D
120 kg m/s
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Solution

The correct option is A 12 kg m/s
Change in momentum =m(v2v1)
Δp=0.5[12(12)]
Δp=0.5×24=12kgm/s


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