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Q.

A body covers 200 cm in the first 2 seconds and 220 cm in the next 4 seconds. The velocity of the body at the end of the 7th second is

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a

10cm s-1

b

20cm s-1

c

5cm s-1

d

30cm s-1

answer is A.

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Detailed Solution

S1=U(2)+12a(2)2 s1=200mS1+S2=U(6)+12a(6)2 S2=220m U=115cm/s a=−15cm/s2 v=U+at  when  t=7 V=10cm/s
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