Question 1

Which expression represents the kinetic energy (KE) of an object?

Accepted Answer

1/2 mv^2

Answer

mv

Answer

1/2 mv

Answer

mv^2

Question 2

What happens to the kinetic energy of an object if its velocity is doubled?

Accepted Answer

It quadruples

Answer

It doubles

Answer

It stays the same

Answer

It triples

Question 3

What is required to change the kinetic energy of an object?

Accepted Answer

An external force

Answer

Cooling it down

Answer

Painting it a different color

Answer

Playing music to it

Question 4

If the mass of an object is halved while its velocity remains the same, what happens to its kinetic energy?

Accepted Answer

It is halved

Answer

It doubles

Answer

It quadruples

Answer

It remains the same

Question 5

A car with a mass of 800 kg is moving at a velocity of 25 m/s. What is its kinetic energy?

Accepted Answer

250000 J

Answer

20000 J

Answer

50000 J

Answer

10500 J

Question 6

A ball of mass 1.5 kg is thrown with a velocity of 10 m/s. What is the kinetic energy of the ball?

Accepted Answer

75 J

Answer

30 J

Answer

150 J

Answer

15 J

Question 7

A cyclist and her bike have a combined mass of 90 kg and are travelling at a speed of 8 m/s. What is the kinetic energy?

Accepted Answer

2880 J

Answer

3600 J

Answer

720 J

Answer

1440 J

Question 8

A truck has a mass of 2000 kg and is moving at a speed of 20 m/s. Calculate its kinetic energy.

Accepted Answer

400000 J

Answer

100000 J

Answer

200000 J

Answer

20000 J

Question 9

A sprinter with a mass of 60 kg is running at a velocity of 9 m/s. What is the kinetic energy of the sprinter?

Accepted Answer

2430 J

Answer

540 J

Answer

1620 J

Answer

810 J

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