Margy is trying to improve her cardio endurance by performing an exercise in which she alternates walking and running 100.0 m each. If Margy is walking at 1.4 m/s and accelerates at 0.20 m/s2 during one of the running portions, what is her final velocity at the end of the 100.0 m? Round your answer to the nearest tenth.

Question

Narad · Answer

Distance s=100m

Initial velocity u=1.4m/s

Acceleration $$a=0.2m/s^{2}$$

Apply equation of motion

$$v^{2}=u^{2}+2as$$

$$v^{2}=1.4^{2}+2*0.2*100 =41.96$$

$$v=\sqrt{41.96} =6.5m/s$$

Final velocity = 6.5m/s