Two particles of masses m, and m, separated by a horizontal distance D are released from the same height h at the same time. Find the vertical position of the center of mass of these wo particles at a time before the two particles strike the ground. Assume no air resistance. (Enter your answer as a function of time t, where t = 0 at the instant the masses are released. Assume the +y-axis points straight up with y = 0 at the ground. Use any variable or symbol stated above along with the following as necessary: g.)

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Rigid Body

A rigid body is an object which does not change its shape or undergo any significant deformation due to an external force or movement. Mathematically speaking, the distance between any two points inside the body doesn't change in any situation.

Rigid Body Dynamics

Rigid bodies are defined as inelastic shapes with negligible deformation, giving them an unchanging center of mass. It is also generally assumed that the mass of a rigid body is uniformly distributed. This property of rigid bodies comes in handy when we deal with concepts like momentum, angular momentum, force and torque. The study of these properties – viz., force, torque, momentum, and angular momentum – of a rigid body, is collectively known as rigid body dynamics (RBD).