## Use the exact values you enter to make later calculations. Jack and Jill are on two different floors of their high rise office building and

Use the exact values you enter to make later calculations. Jack and Jill are on two different floors of their high rise office building and looking out of their respective windows. Jack sees a flower pot go past his window ledge and Jill sees the same pot go past her window ledge a little while later. The time between the two observed events was 4.0 s. Assume air resistance is negligible. (a) If the speed of the pot as it passes Jill’s window is 60.0 m/s, what was its speed when Jack saw it go by

## Answers ( )

The part B of the question is missing and it is;

b) What is the height between the two window ledges?

Answer:

A) 20.76 m/s

B) 161.52 m

Explanation:

A) To calculate the initial speed we use the formula from Newton’s first law of motion:

v = u + at

Making u the subject gives;

u = v – at

Where;

v is the final velocity which is the speed when Jill sees the pot = 60 m/s

u is the initial velocity which is the speed when Jack sees the pot go by

t is the time between the two observed events = 4 s

a in this question is acceleration due to gravity = 9.81 m/s².

Plugging in the relevant values into the initial velocity equation gives;

u = 60 – (9.81 × 4)

u = 20.76 m/s

B) To get the height difference, we will use the formula;

(y1 – y0) = ut + ½at²

Thus, plugging in the relevant values, we have;

y1 – y0 = (20.76 × 4) + (½ × 9.81 × 4²)

(y1 – y0) = 161.52 m