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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > Two particles P and Q have mass 1 kg and 2 kg respectively. They are projected along a vertical line with velocity up = 20 m/s and uQ = 5 m/s when separation between them was 60 m. P was projected vertically up while Q was projected vertically down. Calculate the maximum height attained by the centre of mass of the system of two particles, measured from the initial position of P. Assume that the particles do not collide and that the ground is far below their point of projection [g= 10 m/s^2]

Two particles P and Q have mass 1 kg and 2 kg respectively. They are projected along a vertical line with velocity up = 20 m/s and uQ = 5 m/s when separation between them was 60 m. P was projected vertically up while Q was projected vertically down. Calculate the maximum height attained by the centre of mass of the system of two particles, measured from the initial position of P. Assume that the particles do not collide and that the ground is far below their point of projection [g= 10 m/s^2]

A railway flat car moves at a speed V. The gun barrel makes an angle α = 60∘ with the horizontal. A shell of mass m leaves the barrel at a speed v = 12 m/s relative to the barrel. Find the speed of the flat car V (in m/s) in order that it may stop after the firing. whose mass together with the artillery gun is M = 2 m