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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. |
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Answer» Correct Answer - 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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