# 1. Which of the bodies is moving with  (a) constant speed?  (b) constant acceleration?

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Instruction: The table given below shows distance (in cm) travelled by the bodies A, B and C. Read this data carefully and answer the questions which follow.

Distance (in cm) covered by different bodies

 Time Body A Body B Body C 1st second 20 20 20 2nd second 20 36 60 3rd second 20 24 100 4th second 20 30 140 5th second 20 48 180

1. Which of the bodies is moving with

(a) constant speed?

(b) constant acceleration?

2. Which of the bodies covers

(a) maximum distance in 3 rd second?

(b) minimum distance in 3 rd second?

3. Which of the bodies is moving with non-uniform acceleration?

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1. a) Body A moves with constant speed since it travels equal distance in equal interval of time.

b) Body B moves with constant acceleration since the rate of change of distance per second in it is constant.

2. a) Body C covers the maximum distance in 3rd second.

C covers 100 cm whereas A & B cover 20 cm & 24 cm in 3rd second.

b) Body A covers the minimum distance in 3rd second.

Since A covers only 20 cm which is less than covered by B (24 cm) and C (100 cm)

3. Body C is moving with non-uniform acceleration