Question 4211:

• WAEC 2019

A stone of mass 20g is released from a catapult whose rubber is stretched through 5cm. If the force constant of the rubber is 200Nm\(^{-1}\), calculate the speed with which the stone leaves the catapult.

Question 4212:

• WAEC 2019

(a) The diagram above illustrates a projectile motion. Identify each of the physical quantities labeled P, β, H and R.

(b) Write an equation to show the relationship between P, g and Rmax’ where g is the acceleration due to gravity and Rmax is maximum R.

Question 4213:

• WAEC 2019

State three observable phenomena in which waves behave like a particle.

Question 4214:

• WAEC 2019

List three magnetic elements that determine the earth’s magnetic field at a point.

Question 4215:

• WAEC 2019

Explain each of the following terms as used in Electronics.
(a) free electrons;
(b) holes.