Kelli weighs 425 n, and she is sitting on a playground swing that hangs 0.36 m above the ground. her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. assume that air resistance is negligible. (a) how fast is kelli moving when the swing passes through its lowest position?

V = 3.54 m/s

Explanation:

Using the conservation of energy:

so:

where w is te weigh of kelly, h the distance that kelly decends, m is the mass of kelly and V the velocity in the lowest position.

So, the mass of kelly is:

m = 425N/9.8 = 43.36 Kg

and h is:

h = 1m-0.36m =0.64m

then, replacing values, we get:

Solving for v:

V = 3.54 m/s

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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