An object with a mass of 78 kilograms is lifted through a height of 6 meters. The work done is 4,586.4 J.
Solution:
Work done = mgh
Work done = 78 * 9.8 * 6
Work done = 4,586.4 J. (answer)

A body moving with a velocity of 20 m/s begins to accelerate at 3 m/s2. the body moves 137.5 meters in 5 seconds.
Solution:
s = ut + 1/2 at^2; s = 20 m/s (5 sec) + (1/2) (3 m/s^2) (5 sec)^2
s =100 m + (1.5 m/s^2) (25 s^2)
s = 100 m + 37.5 m
s = 137.5 meters. (answer)

Imagine that a tank is filled with water. The height of the liquid column is 7 meters and the area is 1.5 square meters (m2). The force of gravity acting on the column of water is 102,900 N. Solution: The volume of water is (1.5 m² x 7 m) = 10.5 m³; 10.5 m³ = 10,500 liters; Weight of the water = (10,500 kg) x (9.8 m/s²) = 102,900 newtons.

If a car travels from Town A to Town B on one road at different speeds and stops at red lights, knowing the distance between the towns and the total time of the trip can allow you to calculate average velocity.