Question

An arrow of mass 0.5kg so it has 25J of kinetic energy; find the speed of the arrow v = m/s​

Answer 1

10 m/s

Step-by-step explanation:

Use the kinetic energy formula:

KE=(1/2)mv^2

I always remember it as Kevin is half-mad, and very square.

25J = (1/2)*0.5kg*(v^2)

50J = 0.5kg*(v^2)

100J = v^2

v = 10 m/s

Check it:

KE = (1/2)*0.5*(10^2)

KE = 25J

yep, it's right!