Question 2.2. A book is given a sudden push to make it slide along a desktop. If the initial speed of the slide is doubled, by what factor is the distance that the book slides changed?

Question

(Points : 1)
0.5

0.25

2.0

4.0

Question 3.3. A 720 kg roller-coaster car starts off from Location A. Assuming friction does not impede the car's motion, what will be the change in its potential energy by moving from Location A to Location B?

(Points : 1)
7.1 × 103 J

6.1 × 104 J

6.0 × 105 J

7.8 × 105 J

Question 4.4. A 20 kg cart is moving at 2.0 m/s when a 5.0 N force is applied for a distance of 6.0 m in the direction the car is moving. What is the kinetic energy of the cart at the end of the 6.0 m?
(Points : 1)
40 J

70 J

10 J

30 J

Question 5.5. A 0.145 kg baseball is thrown from a platform above the ground at a 10 m/s. The ball is moving 15 m/s when it strikes the ground. From what height above the ground was the ball thrown?
(Points : 1)
6 m

10 m

5 m

1 m

Question 6.6. An extremely elastic ball loses only 20 percent of its kinetic energy in a bounce. If such a ball were dropped from a height of 5.0 m, how high would the ball bounce?
(Points : 1)
1.0 m

2.0 m

4.0 m

5.0 m

Answer 1

Oops. Forgot my homework -- maybe I can get some sucker to do it for me.

Hmmm...

Answer 2

Im trying to figure these out as well

Answer 3

Which of these is true about mechanical energy?
- mechanical energy sometimes changes into thermal energy

A book is given a sudden push to make it slide along a desktop if the initial speed of the slide is doubled by what factor is the distance that the book slides changed?
- 4.0

A 720 kg roller coaster car starts off from location A Assuming friction does not impede the car's motion..
- 6.0 x 10^5 J

Answer 4

3.04 Quiz Conservation of energy 2

Continuing****
4. 70 J
5. 6 m
6. 4.0 m

*** remember different versions may change answers but these are right

Answer 5

Thanks