PHYSICS ACCELERATION

help! detailed answers are very appreciated!

Physics Name Acceleration #2 V - V Acceleration is defined as rate of change of velocity: a = ---- or v = v + at t starts from rest means v. = 0; comes to a stop means v = 0 a It is also possible to determine distance traveled when time, initial speed and acceleration are known: X =vt+ 1/2 at If v = 0 then d =1/2 at Solve for a: a = 2 (X - v t)/t Solve for a: a = 2d/t- Solve for t: use quadratic - avoid going there! Solve for t: t = V2d/a Complete the units chart! quantity symbol SI unit Time Initial velocity Final velocity Acceleration 2. A light plane must reach a speed of 51m/s (v = 0m/s) for takeoff. How long must the runway be if the constant acceleration of the plane is 3.0m/s and it will lift off after 17 seconds? 3. A car starting from rest accelerates uniformly at 6.1 m/s for 7.0 s How far does the car move?4. An airplane starts from rest and accelerates at a constant +3.00 m/s for 30.0s before leaving the ground. What is its displacement during this time? 5. An astronaut drops a feather (v =0) 1.2 m above the surface of the moon. If the acceleration of the feather (acceleration of gravity on the moon) is 1.62 m/s down, how long does it take the feather to hit the surface? 6. A car decelerated from a speed of 25.0 m/s to rest (v = 0.0m/s) in 5 seconds. How far did it travel in that time? (Hint: first calculate the acceleration and then use d = v t + 1/2 at ) CP physics: acceleration #2 d = v t+ 1/2 at