Let’s Analyze Directions: Solve for the following problems and show your solution on a separate sheet of paper.
1. A 60 – kg man climbs up to the third floor of a building which is 25 m high. What will be the gravitational potential energy of the man as he reached the third floor?
2. What will be the gravitational potential energy of an object with a mass of 2.3 kg when it it is located at the following heights:
a. 6 m?
b. 9 m?
3. A father and son went jogging. If the son weighs 50 kg and the father weighs 75 kg, and both ran

at a speed of 5 m/s, who had the greater kinetic energy?

4. What is the kinetic energy of a 47.30 – kg man running at a speed of 5.0 m/s?

5. A roller coaster car with a mass of 535 kg is travelling at a speed of 128 m/s. What is the kinetic

energy of the roller coaster car?

Question

Answered

Sagot :

Zykecidgo Zykecidgo · Answer 1

Answer:

1. GPE = l 14700 J

2. a) GPE = 135.24J

b) GPE = 202.68J

3. The father

4. KE = 591.25 J

5. KE = 4382720J

Explanation:

1. m=60kg, h=25m, g=9.8m/s^2

GPE=mgh

GPE=60kg×25m×9.8m/s^2

=14700J

2. g=9.8m/s2 m=2.3kg h=6m, 9m

gpe=mgh

a) 2.3kg×9.8m/s2×6m

=135.24J

b) 2.3kg×9.8m/s2×9m

3. The father had more mass, travwelling at the same speed as his son with less mass, so he had more kinetic energy.

4. ke=1/2mv2

m=47.3kg, v=5m/s

ke=47.3kg/2×(5m/s)^2

=591.25j

5.ke=1/2mv2

m=535kg, v=128m/s

1/2×535kg×(128m/s)^2

=4382720J