Question

Which has more momentum, a `4kg` object moving at `4m/s` or a `5kg` object moving at `9m/s`?

Answer 1

Second object.

Explanation:

Momentum is given by the equation,

`p=mv`

• `m` is the mass of the object in kilograms

• `v` is the velocity of the object in meters per second

We got:

`p_1=m_1v_1`

Substitute in given values,

`p_1=4 \ "kg"*4 \ "m/s"`

`=16 \ "m/s"`

Then,

`p_2=m_2v_2`

Same thing, substitute in given values,

`p_2=5 \ "kg"*9 \ "m/s"`

`=45 \ "m/s"`

We see that `p_2>p_1`, and so the second object has more momentum than the first object.