A railroad car of mass M is at rest on frictionless rails when a man o

1.	A railroad car of mass M is at rest on frictionless rails when a man of mass m starts moving on the car towards the engine. If the car recoils with a speed v backward on the rails, with what velocity is the man approaching the engine?
Answer» THANKS for asking the question! ANSWER:: Let the mass moving with a velocity X with respect to the engine. Velocity of the mass with respect to earth is (x-v) towards right. Centre of mass of V = 0 (initially at REST) Therefore , 0 = -Mv + m(x-v) Mv = m(x-v) mx = Mv + mv x = [v(M+m)/m] x = [1 + M/m] v Hope it helps!

A railroad car of mass M is at rest on frictionless rails when a man of mass m starts moving on the car towards the engine. If the car recoils with a speed v backward on the rails, with what velocity is the man approaching the engine?

Answer»

THANKS for asking the question!

ANSWER::

Let the mass moving with a velocity X with respect to the engine.

Velocity of the mass with respect to earth is (x-v) towards right.

Centre of mass of V = 0 (initially at REST)

Therefore , 0 = -Mv + m(x-v)

Mv = m(x-v)

mx = Mv + mv

x = [v(M+m)/m]

x = [1 + M/m] v

Hope it helps!

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A railroad car of mass M is at rest on frictionless rails when a man of mass m starts moving on the car towards the engine. If the car recoils with a speed v backward on the rails, with what velocity is the man approaching the engine?

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