Motion - Jamb Physics Past Questions and Answers

Question 76:

• JAMB 1997

Which of the following with respect to a body performing simple harmonic motion are in phase?

A. Displacement and velocity of the body
B. Displacement and force on the body
C. Velocity and acceleration of the body
D. Force acting on the body and the acceleration

Question 77:

• JAMB 1997

A body of mass 2kg moving vertically upwards has its velocity increased uniformly from 10ms^-1 to 40ms^-1 in 4s. Neglecting air resistance, calculate the upward vertical force acting on the body.[g = 10 ms^-1]

A. 15N
B. 20N
C. 35N
D. 45N

Question 78:

• JAMB 1997

Under constant tension and constant mass per unit length, the note produced by a plucked string is 500Hz when the length of the string is 0.90m. At what length is the frequency 150Hz?

A. 3m
B. 4m
C. 5m
D. 6m

Question 79:

• JAMB 1997

The fig above shows a block of mass m sliding down a rough inclined plane QP at angle \( \theta \) . The forces acting on the block along QP are

A. Mg sinθ and the normal reaction
B. Mg sinθ and the force of friction
C. Mg sinθ and the normal reaction
D. Mg cosθ and the normal reaction

Question 80:

• JAMB 1998

A bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. If the mass of the bullet is 0.025kg and the average resisting force of the wood is 7.5 x 10³N, calculate the speed of the bullet just before it hits the wooden block.

A. 450ms^-1
B. 400ms^-1
C. 300ms^-1
D. 250ms^-1