WAEC Physics Past Questions & Answers - Page 152

756.

A stone of mass 2.0kg is thrown vertically upward with a velocity of 20.0 ms-1, calculate the initial kinetic energy of the stone

A.

200J

B.

400J

C.

800J

D.

1600J

Correct answer is B

K.E = \(\frac{1}{2}Mv^2 = \frac{1}{2} \times 2 \times 20^2 = 400J\)

758.

which of the following statements about simple harmonic motion is correct? The

A.

total mechanical energy is always conserved

B.

linear acceleration is directed to any variable point

C.

linear acceleration varies inversely with displacement

D.

period of oscillation varies linearly as acceleration due to gravity

Correct answer is A

No explanation has been provided for this answer.

759.

Which of the following quantities is a vector?

A.

speed

B.

distance

C.

energy

D.

momentum

Correct answer is D

No explanation has been provided for this answer.

760.

A car accelerates uniformly from rest at 5 ms-2. Determine its speed after 10s

A.

50.0ms-1

B.

25.0ms-1

C.

2.0ms-1

D.

0.5ms-1

Correct answer is A

V = u + at = 0 + 5 x 10 = 50m/s2