1.

A particle has initial velocity `(3 hat i+ 4 hat j)` and has acceleration `(0.1 hat i+ 0.3 hat j)`. Its speed after `10 s` is.A. 7 unitB. `7 sqrt(2)` unitC. 8.5 unitD. 10 unit

Answer» Correct Answer - B
Using `vec v = vec u + vec a t`
`vec v =(3 hat i + 4 hat j)+(0.4 hat i + 0.3 hat j) xx 10`
`rArr vec v = 7 hat i+ 7 hat j`
hence speed `|v| = 7 sqrt(2)`.


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