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Q.

A car moving with constant acceleration covers the distance between two points 180 m apart in 6sec. Its speed as it passes      the second point is 45 m/s. What is its acceleration and its speed at the first point?

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a

−5 m/s2; 15 m/s

b

−5 m/s2; −15 m/s

c

−15 m/s2; 5 m/s

d

5 m/s2; 15 m/s

answer is D.

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Detailed Solution

s=(u+v)2 t180=(u+45)2 6 60=u+45 u=15m/s v=u+a t  45-15 =a(6) a=5 m/s 2
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