Question

# A 200 gm mass has velocity of $$(3\hat i+4\hat j)$$m/s at certain instant. Find its kinetic energy.

A
2.5J
B
0.5J
C
0.8J
D
1.5J

Solution

## The correct option is A $$2.5 J$$First we will calculate the Magnitude of velocity  so $$v=\sqrt{3^2+4^2}=5\ m/s$$Now m=200 gm or 0.2 kgSo $$KE=\dfrac{mv^2}{2}=\dfrac{0.2\times 5^2}{2}$$so $$KE=2.5\ J$$Physics

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