The work done in accelerating a ball to a certain speed

  • Thread starter Kwcty6888
  • Start date
  • #1
Kwcty6888
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Homework Statement


The fastball of a famous pitcher in the National League has
been clocked in excess of 95 mph. Calculate the work done
by the pitcher in accelerating the ball to that speed. The
mass of a baseball is 0.145 kg.

mass = 0.145 kg
final velocity (in m/s) = 42.4688 m/s
initial velocity = 0 m/s

Homework Equations


F = ma
w = F*distance


The Attempt at a Solution


I tried setting up F = ma to find something, but the only known variable is mass. I also tried kinematics, but there are only two known variables that go into the equations and I can't isolate any variables. Is there an equation I'm forgetting, or am I just looking at this problem the wrong way? Thanks.
 

Answers and Replies

  • #2
voko
6,054
391
How is work related to energy?
 
  • #3
Kwcty6888
3
0
Ohhh, work is the change in energy. So the work done would just be the kinetic energy of the ball at the velocity?
 
  • #4
voko
6,054
391
He might very well have done some other work, but the question is specifically about work spent on accelerating the ball.
 
  • #5
Kwcty6888
3
0
Okay got it, thanks!
 

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