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 can use the formula for momentum, which is:

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

We're given the truck's momentum as [tex]\(125,000 \, \text{kg} \cdot \text{m/s}\)[/tex] and its velocity as [tex]\(22.0 \, \text{m/s}\)[/tex]. By rearranging the formula to solve for mass, we get:

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

Plugging in the given values:

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

When you divide these numbers, you get approximately:

[tex]\[ \text{mass} \approx 5681.82 \, \text{kg} \][/tex]

Since the options provided are whole numbers, we round this result to the nearest whole number, which is [tex]\(5682 \, \text{kg}\)[/tex].

However, we look at the given options and find the closest match. The closest choice to [tex]\(5682 \, \text{kg}\)[/tex] is [tex]\(5680 \, \text{kg}\)[/tex].

Therefore, the truck's mass is approximately 5680 kg.

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