PLSSS HELP ! 1.A physics student stands at the top of a set of bleachers. They drop a basketball and it lands 6 seconds later

a. How high are the bleachers?

b. How fast was the basketball traveling at the time it landed?

2) A ball is hit by a baseball bat straight up at 30.0 m/s. The ball is 3.4 m above the ground

a. How long will it take for the ball to reach its highest point? b. How high will the baseball travel?

3) The fuel in a bottle rocket burns for 2.0 s. While burning, the rocket moves upward with an acceleration of 30 m/s?.

a. What is the vertical distance that the rocket travels while the fuel is still burning, and how fast is it traveling at the end of the burn? b. After the fuel stops burning, the rocket continues upward but is now slowing at a rate of 10 m/s2. Estimate the maximum height that the rocket reaches.