Q.

The variation of velocity of a particle with time moving along a straight line is illustrated in the following figure. The distance travelled by the particle in four seconds is 

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a

60 m

b

55 m

c

25 m

d

30 m

answer is B.

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Detailed Solution

Distance = Area under v – t graph

=A1+A2+A3+A4

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=12×1×20+20×1+1220+10×1+10×1=10+20+15+10=55m

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