Acheetah can go from a state of resting to running at 20 m/s in just 2 seconds. what is the cheetah's average acceleration?

Dc versus ac problem. suppose your dc power supply is set to 15 v and the vertical setting on the oscilloscope is at 5 v/div. how many divisions will the trace deflect if you connect the output of the power supply to the scope with the a input switch set on dc? how many divisions if the switch is on ac?