Waec Physics 1988 Past Questions and Answers

Question 6:

• WAEC 1988

A ball of mass 0.5kg moving at 10ms^-1 collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

A. 0.2ms^-1
B. 0.5ms^-1
C. 5.0ms^-1
D. 10.0ms^-1
E. 20.0ms^-1

Question 7:

• WAEC 1988

A body is projected into space with an initial velocity V₀ at an angle, θ to the horizontal. Which of the following statements is/are correct about its motion?
I. The total time of flight is (V₀ Cosθ)/g.
II. The maximum height is (V₀ Sin 2θ)/2g.
III. The range is (V₀² Cos²θ)/g.

A. I & II only
B. I & III only
C. II & III only
D. II only
E. III only

Question 8:

• WAEC 1988

A catapult is used to project a stone. Which of the following energy conversions takes place as the stone is released?

A. The kinetic energy of the stone is converted into gravitational potential energy
B. The gravitational potential energy of the catapult is converted into kinetic energy of the stone
C. The gravitational potential energy is converted into elastic potential energy
D. The elastic potential energy of the catapult is converted into gravitational potential energy of the stone
E. None of the above

Question 9:

• WAEC 1988

A ball is thrown vertically upwards from the ground with an initial velocity of 50ms^-1. What is the total time spent by the ball in the air? (g = 10ms^-2)

A. 2.5s
B. 5.0s
C. 10.0s
D. 15.0s
E. 20.0s

Question 10:

• WAEC 1988

Which of the following correctly gives the relationship between linear speed V and angular speed ω of a body moving uniformly in a circle of radius r?

A. V = ωr
B. V = ω²r
C. V = ωr²
D. V² = ωr
E. V = ω/r