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Sat 5 Nov, 2005 08:47 pm
Why do these 2 following problems have intial velocity equalling zero?
1. A baseball pitcher throws a fastball at a speed of 44 m/s. The acceleration occurs as the pitcher holds the ball in his hand and moves it through an almost staight-line distance of 3.5 m. Calculate the acceleration, assuming it is uniform. Compare this acceleration to the acceleration due to gravity, 9.80m/s^2.
2. One gun can give a small object a velocity of 3.5 km/s moving it through only 2.0 cm.What acceleration does the gun give the object?
I already have a solved solution to both of these, but why do both have zero initial velocities?
while this problem doesn't have initial velocity equalling zero.
A baseball pitcher throws a fastball at 42 meters per second. If the batter is 18 meters from the pitcher, approximately how much time does it take for the ball to reach the batter?
1. 2.3 s
2. 1.9 s
3. 0.86 s
4. 0.43 s
what's the difference between the 2 problems that one get zero as initial velocity and one doesn't?
Each problem has different initial conditions. One of the things they may be trying to teach is critical thinking. We often had extraneous details thrown into the problems when I was in college; you had to learn to read the entire problem and then go back and pick out just the details that were needed.
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