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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. 7,840 kg
C. 8,000 kg
D. 78,400 kg

Answer :

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

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

where:
- [tex]\( PE \)[/tex] is the potential energy (235,200 J in this case),
- [tex]\( m \)[/tex] is the mass of the roller coaster (what we're trying to find),
- [tex]\( g \)[/tex] is the acceleration due to gravity (approximately 9.8 m/s²),
- [tex]\( h \)[/tex] is the height (30 m in this case).

We need to solve for the mass [tex]\( m \)[/tex]. To do this, we rearrange the formula to:

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

Now, plug in the values:

[tex]\[ m = \frac{235,200 \text{ J}}{9.8 \text{ m/s}² \times 30 \text{ m}} \][/tex]

After performing the calculation, you will find:

[tex]\[ m = 800 \text{ kg} \][/tex]

So, the mass of the roller coaster is 800 kg.

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Rewritten by : Barada