# Which has more momentum, a 8kg object moving at 9m/s or a 4kg object moving at 7m/s?

Dec 29, 2015

The one with the mass of $8$ $k g$ and moving $9$ $\frac{m}{s}$ has more momentum.

#### Explanation:

The momentum of an object can be calculated using the formula p=mv where p is the momentum and m is the mass and v is the velocity.

So, the momentum of the first object is:

$p = m v$

$= \left(8 k g\right) \left(9 \frac{m}{s}\right)$

$= 72 N s$

while the second object:

$p = m v$

$= \left(4 k g\right) \left(7 \frac{m}{s}\right)$

$= 28 N s$

So the object which has more momentum is the first object