A baseball is thrown at an angle of 21◦ relative
to the ground at a speed of 20.7 m/s. The ball
is caught 29.2269 m from the thrower.
The acceleration due to gravity is
9.81 m/s
2
.
How long is it in the air?
Answer in units of s.

How high is the tallest spot in the ball’s path?

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?