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Assertion : A body of mass 4 kg has an i...

Assertion : A body of mass 4 kg has an initial velocity `5hat(i)ms^(-1)`. It is subjected to a force of `4hat(j)N`. The displacement of body from origin after 4 s will be `21.5 m`.
Reason : The equation `v=u+a t` can be applied to obtain v if a is constant.

A

If both Assertion and Reason are correct and Reason is the correct explanation of assertion.

B

If both Assertion and Reason are correct but Reason in not the correct explanation of Assertion.

C

If Assertion is true but Reason is false.

D

If Assertion is false but Reason is true.

Text Solution

Verified by Experts

The correct Answer is:
B
`a=(F)/(m)=1 hat(j)N`
`s= u t +(1)/(2)a t^(2)=20 hat(i)+8 hat(j)`
`therefore `s=21.5m`
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