A particle starts from rest. The a−x curve is shown in the figure for the motion of particle. The speed of the particle at x=5m is
A
√80m/s
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B
√40m/s
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C
√50m/s
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D
√60m/s
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Solution
The correct option is A√80m/s As we know from the a−x curve that, v2−u22=Area under the curve Given, u=0 ⇒v22=12×2×10+10×(5−2) ⇒v2=2×40=80⇒v=√80m/s Hence, speed of the particle at x=5m is √80m/s