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An airplane needs to gain an acceleration of 0.79  m/s2  to take off on a  2000 m runway, what is the velocity ( i.e. final velocity) of the airplane just before it takes off? [Pay attention to the units in answer choices] A. 112 km/h B. 203 km/h C. 786 km/h D. 304 km/h   Please explain step by step and the equations used, thank you.

2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.

An object moves with constant velocity or uniform velocity, that means object moves with... . Choose all that apply   A. speed is constant but direction is changing.   B. constant speed in a straight line.   C. changing speed in a straight line.   D. same speed or constant speed.Direction has nothing to do with it.

A rock is thrown straight upward, then falls back down. Consider the motion of the rock from the time just after it is thrown, to the time just before it hits the ground. Neglect air resistance. Which of the following quantities is zero at least one point in the rock’s flight?  A. Neither acceleration, nor velocity   B. Acceleration   C. Velocity   D. Both acceleration and velocity  Which of the following quantities changes direction during the rock’s flight?  A. Neither acceleration, nor velocity   B. Acceleration   C. Velocity   D. Both acceleration and velocity  Which of the following quantities is constant during the rock’s flight?  A. Neither acceleration, nor velocity   B. Acceleration   C. Velocity   D. Both acceleration and velocity

A ball is thrown straight upward from a height of 3.2 m with a velocity of 13.0 m/s. a. What is the maximum height the ball reaches? b. How long does it take the ball to reach the maximum height? c. What is the total time the ball is in the air? d. With what velocity does the ball impact the surface?

Which of the following are examples of velocities? a. +54 m/s. b. 60 miles/hour. c. 70 miles/hr northeast. d. -100 m/s. e. 20 knots. f. a, c, d. g. b, e.

The graph shows the position as a function of time for two trains running on parallel tracks. Which is true?   A. Both trains speed up all the time.  B. None of the above are true.  C. At time t both trains have the same velocity.   D. Both trains have the same velocity at some time before t.