# Difference between revisions of "Skill Set 06.1"

## 1. A 5.2 kg object speeds up from 3.1 m/s to 4.2 m/s. What is the change in kinetic energy? (21 J)

This question is just to see if you can apply the basic formulas for energy, and solve for things like velocities and height. The basic IB formulas for this sort of thing are:

• W = Fs$\cos \Theta$
• $\Delta$Ep = mg$\Delta$h
• Ek = 1/2mv2

Missing from the packet is

• Ep = 1/2kx2