Question

1. Calculate the K.E of a 20 Kg. object that travels at 10 m/s.
2. How much K.E will a 70 Kg roller coaster cart have going downhill at 5 m/s?
Vocabulary Words:
1. Energy
2. mechanical energy
3. heat energy
4. chemical energy
5. electromagnetic energy
6. nuclear energy
7. kinetic energy
8. potential energy
9. Law of Conservation of Energy

por fas ayudenme

Answer 1

The kinetic energy (E) of a massive body in motion can be calculated as half its mass (m) times the square of its velocity (v): E = ½mv²

1.

We have:

• m = 20 kg  (Mass)
• v = 10 m/s  (Velocity)

Substituting and evaluating values ​​in the expression of kinetic energy:

E = ½mv²

E =  ½ (20 kg)(10 m/s)²

E = 1000 J

R/ The  kinetic energy of the object is 1000 J.

2.

We have:

• m = 70 kg  (Mass)
• v = 5 m/s  (Velocity)

Substituting and evaluating values ​​in the expression of kinetic energy:

E = ½mv²

E =  ½ (70 kg)(5 m/s)²

E = 875 J

R/ The  kinetic energy of roller coaster cart is 875 J.