Solving Word Problems involving Direct Variation

A part-timer worker earns Php 120 per hour. How much will he earn if he works for 25 hours?

• Php 960

• Php 2000

• Php 2880

• Php 3000

The distance of the object it falls varies diretly as the square of the time of the fall, how is this expressed in equation form?

Answer explanation

The stretch of a spring varies directly with the weight attached to it. If the spring stretches 3 cm when a 5 kg weight is attached, how far will the spring stretch if a 20 kg weight is attached, assuming the spring obeys Hooke's law?

• 4 cm

• 5 cm

• 12 cm

• 60 cm

The distance a car travels varies directly with time. If the car travels 100 miles in 2 hours, how far will it travel in 5 hours?

• 200 miles

• 250 miles

• 400 miles

• 50 0miles

The electrostatic force between two charges varies directly with the square of the distance between them. If the force is 25 Newtons when the distance is 5 cm, what is the force when the distance is 10 cm?

• 50 Newtons

• 100 Newtons

• 125 Newtons

• 250 Newtons