A) 0 m/s
B) \[20\sqrt{2}\,m/s\]
C) \[20\sqrt{3}\,m/s\]
D) \[40\,\,m/s\]
Correct Answer: D
Solution :
Area between curve and displacement axis = \[\frac{1}{2}\times (12+4)\times 10\]= 80 J In this time body acquire kinetic energy = \[\frac{1}{2}m{{v}^{2}}\] by the law of conservation of energy \[\frac{1}{2}m{{v}^{2}}=80J\] Þ \[\frac{1}{2}\times 0.1\times {{v}^{2}}=80\] Þ v2 = 1600 Þ v = 40 m/s
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