Question

If ball 4 has a mass of 2 kg and it is 5m high, what will be its gravitational potential energy? (g=10 N/kg) *

Answer 1

Answer:

$\boxed {\boxed {\sf 100 \ Joules}}$

Explanation:

Gravitational potential energy can be found using the following formula.

$E_p=m*g*h$

where m is the mass, g is the gravitational acceleration, and h is the height.

The mass of the ball is 2 kilograms, its height is 5 meters, and the acceleration due to gravity is 10 Newtons per kilogram.

$m= 2 \ kg \\h= 5 \ m \\g= 10 \ N/kg$

Substitute the values into the formula.

$E_p=(2 \ kg)(10 \ N/kg)(5 \ m)$

Multiply the first 2 numbers. The kilograms (kg) will cancel out when multiplying.

$E_p=(20 \ N)(5 \ m)$

Multiply again.

$E_p=100 \ N*m$

• 1 Newton meter is equal to 1 Joule
• Therefore, 100 N*m= 100 J

$E_p= 100 \ J$

The gravitational potential energy of the ball is 100 Joules.

Answer 2

Explanation:

Gravitational potential energy

= mgh

= (2kg)(10N/kg)(5m)

= 100J.