Answer: 125 Joules
Explanation:
The equation linking distance, speed and work done together is Ek = 1/2 x mass x speed^2.
It is important to remember that Work done is measured in Joules and so it is the same as working out the energy required i.e. any form of energy like thermal energy or kinetic energy (like in this example).
So.. Ek = kinetic energy (Ek)
Mass = kilograms (kg)
Speed = metres per second (m/s)
Therefore, the answer to this question is:
Ek = 1/2 x 10 x 5^2
Ek = 5 x 25
Ek = 125 J (Joules)
And since Ek is the same as work done..
Work done = 125 J
