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Q.

A body moving with an initial velocity of ${5ms}^{- 1}$ attains a velocity of ${15ms}^{- 1}$ in 3 s. Then the displacement is

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a

20 m

b

15 m

c

40 m

d

30 m

answer is B.

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Detailed Solution

Initial velocity $u = 5 m/s$ , Final velocity $v = 15 m/s$ , Time t = 3 s,

Distance travelled $s = (\frac{v+u}{2}) t$

$s = (\frac{5 + 15}{2}) 3 = 30$

s= 30m

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