Question

A large rock (mass = 4.0 kg) moving at a velocity of 2.0 m/s has a momentum of _______ kg*m/s

Answer 1

The momentum of the large rock is 8.0 kg*m/s.

Step-by-step explanation:

The momentum of an object is calculated by multiplying its mass by its velocity. In this case, the mass of the rock is 4.0 kg and its velocity is 2.0 m/s. To find the momentum, we multiply the mass and velocity:

Momentum = Mass x Velocity

Momentum = 4.0 kg x 2.0 m/s

Momentum = 8.0 kg*m/s

Therefore, the momentum of the large rock is 8.0 kg*m/s.

Answer 2

Step-by-step explanation:

❁
`\underline{ \underline{ \text{Given} }}:`

• Mass of a large rock ( m ) = 4.0 kg
• Velocity ( v ) = 2.0 m/s

❁
`\underline{ \underline{ \text{ \: To \: find}}}:`

• Momentum ( p )

✑
`\underline{ \underline{ \text{Solution}}} :`

`\boxed{ \underline{ \sf{Momentum \: = \: mass \: * \: velocity}}}`

plug the known values :

⟹
`\sf{Momentum = 4.0 \: kg \: * \: 2.0 \:m/s }`

⟹
`\sf{Momentum = 8 \: kg \: m/s}`

`\red{ \boxed{ \boxed{ \tt{⟿ \: Our \: final \: answer : \bold{ \underline{8} }\: kg*m/s}}}}`

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`\underline{ \underline{ \text{Learn \: more about \: momentum}}}:`

Imagine that a car and a truck both have the same speed on the road. Which one can stop easily ? Of course , it is hard to stop the truck relative to the car. The reason is that the car and the truck have the same speed bit different masses. Thus , we can say that to stop a heavier body is harder than to stop a lighter one even both of them have the same speed.

If two tennis balls are hit towards you in different velocities , it is not equally easier to stop them. The ball in more velocity is difficult to stop relatively. Thus , we can say that to stop a body in more velocity is harder than to stop a body with less velocity , eventhough they have the same speed.

The physical quantity that describes the quantity of motion of a body is called momentum. The momentum of a moving body or linear momentum is defined as the product of mass & velocity of a moving body.

Mathematically ,

Momentum = mass × velocity

i.e p = m × v

The SI unit of momentum is kg • m/s. Since velocity is a vector quantity and multiplied with mass ( scalar quantity) , momentum becomes a vector quantity. Direction of momentum is the same as velocity.

Hope I helped ! ♡

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