Calculate the momentum of a block of mass 2000 g rolling down a mountain side at 4 m/s.

The momentum of a body is the product of its mass and velocity. In other words,

P = m x v

where P is the momentum of the body, m is its mass and v is its velocity.

Since the units of mass are kg (typically) and those of velocity are m/s, the units of momentum are kg m/s.

Here, the mass of the block is 2,000 g, which is same as 2 kg (since there are 1000 g in a kg) and the velocity of the block is 4 m/s.

Thus, m = 2,000 g = 2 kg and v = 4 m/s

Thus, P = m x v = 2 kg x 4 m/s = 8 kg m/s.

Hence, the momentum of a block of mass 2 kg, rolling down a mountain side at 4 m/s is 8 kg m/s.

Note that we have assumed that the velocity of the block remains constant throughout its motion.

Hope this helps.

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