Airforcetwo,
What you have to understand is that Change in Momentum = Impulse, as described in the equation F delta T=m delta v. So in this case, it is not 6 momentos on either side, but 6 momentos combined because the initial Momentum must equal the final Momentum, which is the Momentum of...
SkiingAlta,
Your calculation to find mass is correct, the answer is .55kg. For part b, the universal equation for Force is F=ma. In this question, you would multiply 13.0 m/s² (the acceleration) by .55kg (the mass) to get a Force of 7.15 N.
For the second question, your calculation to find...