Question

Directions: For each situation, you need to determine if the object has KE or GPE or both. Then find their values. Be sure to include the correct units.
A 2-kg bowling ball sits on top of a building that is 40 meters tall.



Circle one: KE / GPE / both



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









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:







A 2-kg bowling ball rolls at a speed of 10 m/s on the ground.



Circle one: KE / GPE / both



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







A 20-kg child is tossed up into the air by her parent. The child is 2 meters off the ground




traveling 5 m/s.



Circle one: KE / GPE / both



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



























Part 2: Finding Speed and Height Using Energy



Directions: Use the KE and GPE equations to solve for speed or height depending on the situation.



A 1,000-kg car has 50,000 joules of kinetic energy. What is its speed?





A 200-kg boulder has 39,200 joules of gravitational potential energy. What height is it at?





A 1-kg model airplane has 12.5 joules of kinetic energy and 98 joules of gravitational potential energy. What is its speed? What is its height?

Answer 1

 A 2-kg bowling ball sits on top of a building that is 40 meters tall.

GPE

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

its moving n its on top of a bldg. so ans is both KE n GPE

A 2-kg bowling ball rolls at a speed of 10 m/s on the ground.

KE

A 20-kg child is tossed up into the air by her parent. The child is 2 meters off the ground traveling 5 m/s.

moving n in the air. ans is both KE n GPE

eqn:  KE= 1/2mv^2, GPE=hmg

A 1,000-kg car has 50,000 joules of kinetic energy. What is its speed?

50000=1/2*1000^v^2

v=10m/s

 A 200-kg boulder has 39,200 joules of gravitational potential energy. What height is it at?

39200=200*9.8*h

h=20m

A 1-kg model airplane has 12.5 joules of kinetic energy and 98 joules of gravitational potential energy. What is its speed? What is its height?

12.5=1/2*1*v^2

v=5m/s

98=1*9.8*h

h=10m

Answer 2

Part 1

First  GPE
Second  both KE n GPE
Third  KE
Fourth  both KE n GPE


A 1,000-kg car has 50,000 joules of kinetic energy.

1/2*1000^speed^2=50000
speed=10m/s

 A 200-kg boulder has 39,200 joules of gravitational potential energy.
200*9.8*height=39200
height=20m

A 1-kg model airplane has 12.5 joules of kinetic energy and 98 joules of gravitational potential energy.

1/2*1*speed^2=12.5
speed=5m/s
1*9.8*height=98
height=10m