Velocity-time graph for a body of mass 10 kg is shown in figure. Work-done on the body in first two seconds of the motion is: [JEE ONLINE 10-04-2016] |
A) 12000 J
B) 12000 J
C) 4500 J
D) 9300 J
Correct Answer: C
Solution :
[c] |
\[\frac{8}{V}=\frac{10}{50}\] |
\[V=40\,m/s\] |
\[W=\frac{1}{2}\times 10\times (1600-2500)\] |
\[=\frac{1}{2}\times 10\times (-900)\] |
\[=-4500\,J\] |
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