1- If Serena's racket is in contact with the ball for .005 seconds, what is the average force she hits the ball during her serve? This calculation is in Newtons.

https://www.youtube.com/watch?time_continue=33&v=-ZLQCsAR_Wk&feature=emb_title

2-According to the Sport Science Video on Serena's serve, how long does it take for the eye to pick up the ball once she hits the serve? Write the time in milliseconds.

https://www.youtube.com/watch?v=LXEoK1dufbk

3-What is the difference (subtraction) between the time it takes a softball pitch thrown at 70 mph to reach home and a 100 mph major league pitch..

4-How much less time do you have to field a 100 mph grounder, than a Serena Williams serve? (Again subtraction)

5-Using x = v(t), calculate the time it took for the ball to reach you at the plate.

6-Did the answer matches the video within an error of .05?

a-Yes

b-Not enough information given

https://www.youtube.com/watch?v=xgz5-XToJIw

7-In the base stealing video, the runner went from first to second base in 3.5 s. Using your calculation for 15 mph to ft/s, How many feet from the second base was he when he started? We are assuming this is the runner's average speed.

8-From the stretch, the pitcher's throwing motion takes how long?

a-0.8 seconds

b-0.70 seconds

9-Whoa! That last answer was a huge number! If the acceleration due to gravity is 32 ft/s^2, how many "g's" is that previous answer?

10-In stealing a base, what is the primary factor in the runner being successful in stealing a base?

a-The "jump"

b-The lead off

11-For every one foot the catcher is "off", the base the runner gains an advantage of how many feet?

a-3 feet

b-2 feet

c-4 feet

12-Let's take a look at something here. I thought the 15 mph for a base runner was kind of slow. I mean, it was a heck of a lot faster than I could run, but still, 15 mph, equates to about 6.7 m/s. We saw earlier that Usain Bolt average speed was 100 m/9.59 s which is 10.4 m/s. I just looked at the NCAA men's 100 m dash record this year--10.82 s. Calculate that speed in mph.

13-Convert Wilt's 48 inches leap into meters. Remember, use at least 4 sigfigs.

14-What was Wilt's Gravitational Potential energy at 48 inches? He had a mass of 125 kg.

15-Calculate Wilt's velocity when he immediately left the floor. Again, use 4 sigfigs. The reason we have to use so many sigfigs is that we're converting inches and meters.

16-What was Wilt's velocity when he came back down to the floor? What goes up must come down. So that means, don't forget the negative sign!

17-Now calculate how long Wilt was in the air. It's about as close to 1 second as you can get! Use 4 sigfigs. Some of you, due to rounding, may have exceeded 1.0 s.