Question

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. m/s

Answer 1

6.5

Step-by-step explanation:

Answer 2

6.5 m/s

Step-by-step explanation:

We are given that

Distance, s=100 m

Initial speed, u=1.4 m/s

Acceleration,
`a=0.20 m/s^2`

We have to find the final velocity at the end of the 100.0 m.

We know that

`v^2-u^2=2as`

Using the formula

`v^2-(1.4)^2=2* 0.20* 100`

`v^2-1.96=40`

`v^2=40+1.96`

`v^2=41.96`

`v=√(41.96)`

`v=6.5 m/s`

Hence, her final velocity at the end of the 100.0 m=6.5 m/s