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Question

A particle is moving in x-y-plane at 2 m/s along x-axis. 2 seconds later, its velocity is 4 m/s in a direction making 600 with positive x-axis. Its average acceleration for this period of motion is :

A
5m/s2, along y-axis
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B
3m/s2, along y-axis
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C
5m/s2, along at 600 with positive x-axis
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D
3s2, along at 600 with positive x-axis
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Solution

The correct option is B 3m/s2, along y-axis
Initial velocity 2^im/s
Time =2sec
Hence the new velocity will be along x-axis and y-axis (two components)
So according will also have two components
According to along y-axis
Initial velocity =0^im/s
Final velocity=4sin60°m/s=432=432=432÷2=3m/s
Hence Option B is correct.

1019741_1068215_ans_7af6beb93cab43b287a1a2bd988f2cf8.png

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