Question

A body travels 200 cm. in first 2 sec and 220 cm in next 4 sec. what will be the velocity of
body at the end of 7 sec from the start?​

Answer 1

Answer:

Correct option is

A

10 cms

−1

Explanation:

s=ut+

2

1

at

2

For case 1.

200=2u+2a

u+a=100....(1)

For case 2. .i.e. next 4 seconds, we have distance =420 cm and time =6 s

420=6u+18a

u+3a=70....(2)

Solving equation 1 and 2, we get,

u=115 cm/s and a=−15 cm/s

2

Now by

v=u+at

v=115−15×7

v=10 cm/s

Hence answer is A.

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