a frieght train rolls at the same speed but has twice as much mass its momentum is
if the momentum is mv, then doubling the mass gives momentum of (2m)v = 2(mv) so the momentum doubles.
To determine the momentum of an object, you need to know its mass and velocity. The formula for momentum is:
Momentum = mass × velocity
In this case, you mentioned that a freight train rolls at the same speed but has twice as much mass. Let's assume the mass of the initial object is "m" and the velocity is "v". Since the freight train has twice as much mass, its mass would be 2m.
Now, calculating the momentum for both scenarios:
For the initial object:
Momentum = mass × velocity = m × v
For the freight train:
Momentum = mass × velocity = (2m) × v
Comparing the two formulas, we can see that the momentum of the freight train is:
2 × (m × v) = 2mv
Therefore, the momentum of the freight train is twice the momentum of the initial object when both objects are moving at the same speed.