Post Utme Physics Past Questions and Answers

Question 381:

Niagara falls are 50 m high. Calculate the potential energy of 0.1 cubic meter of water at the top relative to the bottom. Density of water is 1000 kg m 3. Take g = 10 m/s2

A. 48kJ
B. 50 kJ
C. 51 kJ
D. 61kJ

Question 382:

A bullet of mass 15 g is fired from a riffle with a velocity 100 m/s. If the mass of the riffle is 1 kg.
What is the recoil velocity of the riffle?

A. 1.5 m/s
B. 1.8 m/s
C. 1.2 m/s
D. 2.1 m/s

Question 383:

A ball is thrown vertically upwards with a velocity of 30 m/s.
Find the greatest height attained ____________

A. 40m
B. 50 m
C. 55 m
D. 45 m

Question 384:

The tension in a rope pulling a log is 100 N, the mass of the log is 50 kg and the frictional force on the log is 20 N.
What is the acceleration of the log?

A. 2 m/s2
B. 1.6 m/s2.
C. 1.8 m/s2
D. 2.2 m/s2

Question 385:

A body of mass 1 kg falls freely from rest through a height of 150 m.
Calculate the velocity of the body when it strikes the floor (g-10 m/s²).

A. 54.8 m/s
B. 45.2 m/s
C. 38.7 m/s
D. 65.8 m/s