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A situation is shown in which two object...

A situation is shown in which two objects A and B start their motion from same point in same direction. The graph of their velocities against time is drawn. `u_A and u_B` are the initial velocities of A and B respectively. T is the time at which their velocities become equal after start of motion. You cannot use the data of one question while solving another question of the same set. So all the questions are independent of each other.
7. After 10 s of the start of motion of both objects A and B, find the value of velocity of A if `u_A = 6 ms^-1 , u_B = 12 ms^-1` and at T velocity of A is `8 ms^-1 and T = 4s`

A

`12 ms^-1`

B

`10 ms^-1`

C

`15 ms^-1`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
D
`8=6+a_AT=6+4a_A`
`:. a_A=0.5 m//s`
At 10s,
`v_A=u_A+a_At`
`=(6)+(0.5)(10)`
`=11 m//s`
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