Question 1

A student lifts a 15 N mass through a distance of 1.5 m. What is the work done?

Accepted Answer

22.5 J

Answer

0.1 J

Answer

10 J

Question 2

A weightlifter lifts a barbell of mass 45 kg through a height of 0.75 m. What is the gravitational

potential energy gained by the barbell (gravity = 10 N/kg)?

Accepted Answer

337.50 J

Answer

33.75 J

Answer

60 J

Question 3

Which of the following equations represents the relationship between kinetic energy, velocity and mass of an object.

Accepted Answer

KE = ½ × m × v²

Answer

KE = ½ × m × v

Answer

KE = v/(½ × m)

Question 4

An asteroid of mass 500 kg approaches the Earth’s ground at a speed of 1000 m/s. What is the

kinetic energy of the asteroid?

Accepted Answer

250 × 10⁶ J

Answer

250 kJ

Answer

5.0 × 10⁶ J

Question 5

Which are the units of work?

Accepted Answer

joules

Answer

Watts

Answer

N/M

Related quizzes