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A roller coaster with a potential energy of [tex]$235,200 J$[/tex] sits at the top of a 30 m high hill. What is the mass of the roller coaster? (Formula: [tex]$PE = mgh$[/tex])

A. 800 kg
B. [tex]$7,840 \, \text{kg}$[/tex]
C. 8,000 kg
D. [tex]$78,400 \, \text{kg}$[/tex]

Answer :

To determine the mass of the roller coaster, we can use the formula for potential energy:

[tex]\[ PE = m \cdot g \cdot h \][/tex]

where:
- [tex]\( PE \)[/tex] is the potential energy,
- [tex]\( m \)[/tex] is the mass,
- [tex]\( g \)[/tex] is the acceleration due to gravity (approximately [tex]\( 9.8 \, \text{m/s}^2 \)[/tex]),
- [tex]\( h \)[/tex] is the height.

We need to solve for the mass ([tex]\( m \)[/tex]). We can rearrange the formula to find [tex]\( m \)[/tex]:

[tex]\[ m = \frac{PE}{g \cdot h} \][/tex]

Given values:
- [tex]\( PE = 235,200 \, \text{Joules} \)[/tex]
- [tex]\( h = 30 \, \text{meters} \)[/tex]
- [tex]\( g = 9.8 \, \text{m/s}^2 \)[/tex]

Now, plug in the values:

[tex]\[ m = \frac{235,200}{9.8 \cdot 30} \][/tex]

[tex]\[ m = \frac{235,200}{294} \][/tex]

[tex]\[ m = 800 \][/tex]

Thus, the mass of the roller coaster is [tex]\( 800 \, \text{kg} \)[/tex].

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