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A body of mass 4 kg lying on a rough plane inclined at \(30^\circ\) to the horizontal has an acceleration of 2 ms\(^{-2}\) when pulled directly up the plane by a force of 6 kg wt. Calculate its acceleration when a force of 6 kg wt. Calculate its acceleration when a force of 3 kg wt is applied down the plane. Given : g = 10 ms\(^{-2}\).
Updated Wed, 28 Aug 2019 10:44 am
A projectile is fired at an angle of \(45^\circ\) with the horizontal.
Elevation angle of the projectile at its highest point as seen from the point of projection is
(a) \(tan^{-1} (\frac {\sqrt 3}{2})\)
(b) \(45^\circ\)
(c) \(60^\circ\)
(d) \(tan^{-1} \frac{1}{2}\)
Updated Wed, 28 Aug 2019 10:24 am
