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JAMB Physics Past Questions & Answers - Page 174

866.

A body moving with uniform acceleration has two points(5, 15) and (20, 60) on the velocity-times graph of its motion. Calculate the acceleration

0.25ms^-2

3.00ms^-2

4.00ms^-2

9.00ms^-2

16.00ms^-2

View answer & explanation

Correct answer is B

slope = acceleration

a = $\frac{v_2 - v_1}{t_2 - t_1} = \frac{60- 15}{20 - 5}$

= 3ms^-2

867.

A ball is projected horizontally from the top of a hill with a velocity of 20m^-1. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10ms^-2)

20m

40m

80m

160m

200m

View answer & explanation

Correct answer is C

Initial horizontal velocity = 20ms^-1

Initial vertical velocity = 0

s = ut + $\frac{1}{2}gt^2$ = 0 x 5 x 4²

= 80m

868.

A body moves with a constant speed but has an acceleration. This is possible if it

moves in a straight line

moves in a circle

is oscillating

is in equilibrum

has a varrying acceleration

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

869.

The following are the scores of ten students in a test of 20 marks: 15, 16, 17, 13, 16, 8, 5, 16, 19, 17. What is the modal?

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

870.

The process whereby a substance changes from a solid to liquid when heat is applied, is called?

Evaporation

Vaporization

Fission

Fusion

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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