Motion - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1978

A palm fruit dropped to the ground from the top of a tree 45m tall. How long does it take to reach the ground? (g = 10ms^-2)

A. 9s
B. 4.5s
C. 6s
D. 7.5s
E. 3s

Question 7:

• JAMB 1978

A machine gun with a mass of 5kg fires a 50g bullet at speed of 100ms^-1. The recoil speed of the machine gun is

A. 0.5 msec^-1
B. 1.5 msec^-1
C. 1 msec^-1
D. 2 msec^-1
E. 4 msec^-1

Question 8:

• JAMB 1978

The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is

A. \(\frac{mv^2}{r}\)
B. \(\frac{mr^2}{v}\)
C. \(\frac{mr}{v}\)
D. \(\frac{mv}{r^2}\)
E. \(\frac{mv}{r}\)

Question 9:

• JAMB 1979

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of

A. 4
B. \(\frac{\pi}{2}\)
C. \(\frac{1}{4}\)
D. 2\(\pi\)
E. 2

Question 10:

• JAMB 1979

Which of the following statements is true? The frequency of a vibrating string is

A. Proportional to its length
B. Inversely proportional to the tension within it
C. Proportional to the aptitude of vibration
D. Inversely proportional to its cross-section
E. Proportional to the square root of the tension within it