Posted by **Mandy** on Wednesday, November 30, 2011 at 11:17pm.

Pam has a mass of 40Kg and she is at rest on smooth, level, frictionless ice. Pam Straps on a rocket pack. The rocket supplies a constant force for 22m and Pam acquires a speed of 62 m/s.

A) What is the magnitude of the force?

B) What is Pam's final Kinetic Energy?

- PreAP Physics -
**drwls**, Wednesday, November 30, 2011 at 11:35pm
First compute the time t that the force acts.

Vaverage*t = Vfinal*t/2

= (31 m/s)*t = 22 m

t = 0.7097 s

a = Vfinal/t = 62/0.7097 = 87.4 m/s^2

F = M a = ?

Final KE = (1/2) M Vfinal^2

(That part ie easy!)

- PreAP Physics -
**Mandy**, Wednesday, November 30, 2011 at 11:51pm
To: DRWLS,

I got 3500 Newtons for part A? What am I doing wrong?

- PreAP Physics -
**drwls**, Wednesday, November 30, 2011 at 11:53pm
I get about the same answer for Part A.

- PreAP Physics -
**Mandy**, Thursday, December 1, 2011 at 12:00am
I did not use time in my equation. I used Force * Distance= change KE for Part A and got the 3500 Newtons.

What am I doing wrong?

- PreAP Physics -
**drwls**, Thursday, December 1, 2011 at 12:07am
There is nothing wrong with your answer or method that I can see. I got the same answer (to three significant fgures) with a different method.

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