the speed of the fastest pitched baseball was 45 m/s, and the ball's mass was 145 g. (a) What was the magnitude of the momentum of this ball, and how many joules of kinetic energy did it have? (b) How fast would a 57 gram ball have to travel to have the same amount of (i) kinetic energy and (ii) momentum
27.5 m/s
How fast does a 142-gram baseball have to be traveling to achieve a momentum of 3.905 kg m/s?
P initial=(145g)*(45 m/s)
=6525 g*m/s
F= 0-6525/1.0s
= -6525N
This is part A
Normally, you should not use non-standard units, such as grams. Most used kg, which makes momentum kg*m/s
So that makes your calculations wrong, if you don't change g to kg, because you list it in Newtons (Newton=kg*m/s)
ok, so I will change g to kg.
And for part b, just plug in the different mass into the equation and solve for momentum and KE?