Two particles are projected at the same instant with speeds `v_(1)` and `v_(2)` making angles `alpha` and `beta` with the horizontal as shown in the figure. Nelecting air resistance, the trajectory of the mass center the two particles

Options

A. can be a vertical straight line
B. can be a horizontal straight line
C. is a straight line
D. is a parabola

Answer

A

Explanation

Ans. (1)
If `m_(1)v_(1)cosalphanem_(2)v_(2)`, then centre of mass will move in a parabola.
If `m_(1)v_(1)cosalpha=m_(2)v_(2)`, then centre of mass will move in straight line.