Question
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?
A) What is the magnitude of the force?
B) What is Pam's final Kinetic Energy?
Answers
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!)
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!)
To: DRWLS,
I got 3500 Newtons for part A? What am I doing wrong?
I got 3500 Newtons for part A? What am I doing wrong?
I get about the same answer for Part A.
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?
What am I doing wrong?
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.
just do it lol.