Assuming no air resistance, if the time for a projectile to get to the highest point is 27s, what would be its total flight time (in s)

A football quarterback runs 11.5 m straight down the playing field in 2.42 s. He is then hit and pushed 2.75 m straight backward in 1.64 s. He breaks the tackle and runs straight forward another 23.1 m in 5.54 s. We assume the forward direction to be positive, and the backward position to be negative. Calculate his average velocity in m/s a. for each of the three intervals; b. for the entire motion. Hint a. His average velocities for each of the three intervals are o first interval v₁ = m/s Enter an integer or decimal number [more..] m/s o second interval v₂ = m/s othird interval v3 = b. His average velocity for the entire motion is v = m/s

6. The instantaneous speed of a figure that describes a plane trajectory is v=ti + 2tj (m/s). ( THE v ,i and the j both have arrow above them) a) Calculate the numerical value of the speed at t = 1 s and at t = 5 s. b) What is the average acceleration vector in that time interval? c) What is the acceleration at t = 5s?

A swimmer bounces almost straight up from a diving board and falls vertically feet first into a pool. She starts with a speed of 3.4 m/s and her takeoff point is 1.9 m above the pool's surface. a. For how long are her feet in the air , in seconds? here is my ans. 0.34? b. What is the height above the board, in meters, of her highest point? c. What is her velocity , in meters per second, when her feet hit the water? assume the vertical component is positive upwards.