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A particle has initial velocity of 3î + 4ĵ and an acceleration of 0.4î + 0.3ĵ. Its speed after 10 s is:

1. 7√2 units
2. 7 units
3. 8.5 units
4. 10 units

Correct answer: 7√2 units

Solution

The final velocity can be calculated by adding the initial velocity to the product of acceleration and time. After 10 seconds, the resultant velocity vector's magnitude is found to be 7√2 units, confirming that option A is correct.

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