Question 4636:

• NECO 2009

A ball of mass 0.1kg moving with velocity of 20ms-1 is hit by a force which acts on it for 0.02s. If the ball moves off in the opposite direction with a velocity of 25ms-1 , calculate the magnitude of the force.

A. 25N
B. 100N
C. 125N
D. 225N
E. 250N

Question 4637:

• NECO 2009

An object of mass 2kg moves for 5s with a uniform velocity of 10ms. What is the magnitude of its acceleration in ms^-2
?

A. Zero
B. 2.5
C. 10
D. 12.5
E. 100

Question 4638:

• NECO 2009

In the electrical method of making a magnet, the polar the magnet formed depends on the ____________

A. Amount of current passed
B. Direction of the current
C. Nature of the material used
D. Orientation of the magnetic material in space
E. Size of the magnetic material

Question 4639:

• NECO 2009

Two images Y and X are formed by a plane mirror and a convex mirror respectively. Which of the following is correct about their characteristics?

A. Both are inverted
B. The magnification of Y is greater than one while that of X is one
C. The magnification of Y is one while that of X is less than one
D. Y is inverted while X is erect
E. Y is real while X is virtual.

Question 4640:

• NECO 2009

The electric potential at a distance d from a point charge q in air of permittivity e_o is expressed as ____________

A. Q² ÷ 4πe_od
B. Q² ÷ 4πe_o
C. Q ÷ 4πe_od²
D. Q ÷ 4πe_od
E. Q ÷ 4πe_o²d