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A horizontal force F = 2t N, where t is in seconds, acts on a block of mass 2 kg placed on smooth horizontal surface at rest. Kinetic energy of block at t = 2 s, is

एक क्षैतिज बल F = 2t N, जहाँ t सेकण्ड में है, चिकने क्षैतिज पृष्ठ पर विराम में रखे 2 kg द्रव्यमान के एक गुटके पर कार्य करता है। t = 2 s पर गुटके की गतिज ऊर्जा है


A
4 J
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B
8 J
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C
2 J
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D
6 J
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Solution

The correct option is A 4 J
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