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A particle has an initial velocity 3hati...

A particle has an initial velocity `3hati+4hatj` and an accleration of `0.4hati+0.3hatj`. Its speed after 10s is

Text Solution

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`vec(v) = vec(u) + vec(at)`
` = (3hati + 4hatj) + (0.4hati + 0.3hatj) 10`
` = 3hati + 4hatj + 4hati + 3hatj = 7hati + 7hatj`
`|vec(v)| = sqrt(49 + 49) = 7sqrt(2)`
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