High School

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A large truck is moving at [tex]22.0 \, \text{m/s}[/tex]. If its momentum is [tex]125,000 \, \text{kg} \cdot \frac{\text{m}}{\text{s}}[/tex], what is the truck's mass?

A. 176 kg
B. 2750 kg
C. 5680 kg
D. [tex]11,400 \, \text{kg}[/tex]

Answer :

To find the mass of the truck, we use the formula for momentum:

[tex]\[ \text{Momentum} = \text{mass} \times \text{velocity} \][/tex]

Given:
- The momentum of the truck is [tex]\( 125,000 \, \text{kg} \cdot \frac{\text{m}}{\text{s}} \)[/tex].
- The velocity of the truck is [tex]\( 22.0 \, \text{m/s} \)[/tex].

We need to solve for the mass, so we rearrange the equation to find:

[tex]\[ \text{mass} = \frac{\text{Momentum}}{\text{velocity}} \][/tex]

Substitute the given values into the equation:

[tex]\[ \text{mass} = \frac{125,000 \, \text{kg} \cdot \frac{\text{m}}{\text{s}}}{22.0 \, \text{m/s}} \][/tex]

When you perform this division, the mass of the truck is approximately [tex]\( 5681.818 \, \text{kg} \)[/tex].

Since the answer should match one of the given options, we round this value to the nearest whole number, which is [tex]\( 5682 \, \text{kg} \)[/tex]. However, since the options provided in the question are:

- 176 kg
- 2750 kg
- 5680 kg
- [tex]\( 11,400 \, \text{kg} \)[/tex]

The closest to our computed value is [tex]\( 5680 \, \text{kg} \)[/tex].

Therefore, the truck's mass is approximately [tex]\( 5680 \, \text{kg} \)[/tex].

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