# Projectile Problems (very basic)

1. May 17, 2014

### gcombina

A projectile is launched with 200 kg.m/s. If Jennifer weighs 583 N, what is the magnitude of her momentum?
a) 97.0 kg.m/s
b) 137 kg.ms
c) 68.6 kg.m/s
d) 672 kg.m/s
e) 951 kg/m/s

2. May 17, 2014

### gcombina

My attempt so I got these two formulas
1) P = mv = 200 kg
2) KE = 1/2 mv

so I need mass right? so I said ok, m = P/v
I solve for m = p/v
m = 200 / v
then i got stocked
I need to find the value of "v"
so I went to KE = 1/2 mv
mv = KE / (1/2)
v = (KE/1/2) / m
v = (1000 / (1/2) ) / m
v = 2000 / m

3. May 17, 2014

### gcombina

I am lost

4. May 17, 2014

Kinetic energy= $\frac{1}{2}mv^2$