Average force exerted on a baseball

Tags:
1. Oct 17, 2015

vaibzzz123

1. Question
A 0.145kg baseball moving horizontally at 35.0m/s strikes a bat and is popped straight up to a height of 55.6m before turning around. If the contact time is 0.50ms, calculate the average force on the ball during the contact.

2. Relevant equations
p=mv
Δp=mΔv=fΔt
Ek=0.5mv^2 (?)
Ep=mgh (?)

3. The attempt at a solution
pinitial=(35)(.145)=5.075 kg*m/s

I was going to use the time that was given, but I'm unsure if the "ms" unit was a typo or was written on purpose. If it was on purpose, I'm unsure how I should use it

2. Oct 17, 2015

Orodruin

Staff Emeritus
Why do you think it is a typo? What do you think "ms" means? Are you familiar with the SI prefixes?

3. Oct 17, 2015

vaibzzz123

Ah, didn't realize that it meant milliseconds! First time I've ever seen that in Physics. Would that mean 0.50ms=0.5*10^-3s or 5*10^-4s?

4. Oct 17, 2015

Orodruin

Staff Emeritus
Yes.

The SI prefixes may be used together with any unit in the SI system. It is a good lesson to take in.

Edit: The caveat being the use together with the SI unit kg ...