Question

Please help!!

2. A 2-kg bowling ball rolls at a speed of 5 m/s on the roof of the building that is 40 tall.

Circle one: KE / GPE / both

Show your work for finding the values of each type of energy the object has:

Answer 1

Both

Kinetic energy is 25 joule

Potential energy is 784.8 joule

Explanation:

Given : A 2-kg bowling ball rolls at a speed of 5 m/s on the roof of the building that is 40 tall.

To find : Is it KE or GPE or Both

Solution :

Mass of the ball - 2 kg

Velocity of the ball - 5 m/s

Height - 40 tall

Both the energy is applied on the object.

1) Kinetic energy (KE)

Formula to find KE is
`KE=(1)/(2)mv^2`

`KE=(1)/(2)(2)(5)^2`

`KE=25`

Kinetic energy is 25 joule.

2) Potential energy (GPE)

Formula to find GPE is
`PE=mgh`

g is the acceleration due to gravity,
`g=9.81 m/s^2`

`PE=(2)(9.81)(40)`

`PE=784.8`

Potential energy is 784.8 joule.