7. How much G. P.E. does a 5 kg rock that is 8 m above the ground has? a. 392 N
b. 39.2 N
C 39.2 J
d. 392 J
8. Kinetic energy is the energy of
a. Potential
b. Objects at rest
c. Objects in motion
d. Accelerating objects
9. Kinetic energy of an object is directly proportional to the square of its speed
therefore,
a. If the KE will increase, then the speed will decrease.
b. Increases with speed, the KE will increase also but only half
c. KE and speed are the same always.
d. If the speed is doubled, then KE will be quadrupled
10. An object's kinetic energy remains constant if
a. an object remains the same size and continues to move at the same speed
b. an object remains the same size
c. an object continues to move at the same speed
d. an object doesn't move
11. What happens to the kinetic energy of a moving object as the mass remains the
same, but the velocity increases?
a. Kinetic energy increases
b. Kinetic energy decreases
c. Kinetic energy stays the same
d. Potential energy increases

7. A

8. C

9. C

10. A

11. A

Explanation:

7. How much G.P.E. does a 5 kg rock that is 8 m above the ground has?

Given:

m = 5kg

h = 8m

g = 9.81 m/s² (acceleration due gravity)

Unknown:

PEg or gravitational potential energy

Formula and Solution:

PEg = mgh

PEg = (5kg)(9.81 m/s²)(8m)

Final

PEg = 392.4 kgm²/s² or simplify as 392.4 J rounding off will be equal to 392 J

8. Kinetic energy is the energy of

C. Objects in motion

Explanation:

All moving things have kinetic energy. It is the energy possessed by an object due to its motion or movement.

9.Kinetic energy of an object is directly proportional to the square of its speed . therefore,

C. KE and speed are the same always.

Explanation:

The heavier a thing is, and the faster it moves, the more kinetic energy it has. So always the same faster moves, more kinetic energy

10. An object's kinetic energy remains constant if

A. an object remains the same size and continues to move at the same speed

Explanation:

The heavier a thing is, and the faster it moves, the more kinetic energy it has.

11. What happens to the kinetic energy of a moving object as the mass remains the  same, but the velocity increases?

A. Kinetic energy increases

Explanation:

The heavier a thing is, and the faster it moves, the more kinetic energy it has. So if the velocity or speed increases the kinetic energy also increases

Hope it was very helpful to you and others. Thank you - By Answer045

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