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A racing motor boat speeds up in a strai...

A racing motor boat speeds up in a straight line in a lake, from rest. Referring to the acceleration-displacement graph for the speeding boat find its speed when it passes a raft at a distance of `40m` from the starting point.
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Text Solution

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`v = sqrt(v_(0)^(2) + 2 (A))`
where, `A = (1)/(2) xx 40 xx 1 = 20`
and `v_(0) = 0`
This gives `v = sqrt(40) ~= 6.5 m//s`
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