A particle moves in the X-Y plane under the influence of a force such that its linear momentum is p(t) = A [ i (kt) - j (kt) ], where A and k are constants. The angle between the force and the momentum is

JEE Advanced 2007 Physics question

Physics Motion in a Plane JEE Advanced 2007

A particle moves in the X-Y plane under the influence of a force such that its linear momentum is , where A and k are constants. The angle between the force and the momentum is

(A)0°
(B)30°
(C)45°
(D)90°Correct

Answer: (D)

Solution

. Then $ F· p = - kt kt + kt kt] =

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Question ID VK-037472