A commuter backs her car out of her garage with a constant acceleration of 1.40 m/s. (For each answer, enter a number.) (a) How long in seconds does it take her to reach a speed of 1.90 m/s? S (b) If she then brakes to a stop in 0.8 s, what is her (constant) deceleration in m/s? m/s A helicopter blade spins at exactly 95 revolutions per minute. Its tip is 5.50 m from the center of rotation. (For each answer, enter a number.) (a) Calculate the average speed (in m/s) of the blade tip in the helicopter's frame of reference. m/s (b) What is its average velocity (in m/s) over one revolution? m/s A student drove to the university from her home and noted that the odometer reading of her car increased by 13.0 km. The trip took 18.0 min. (For each answer, enter a number.) (a) What was her average speed in km/h? km/h (b) If the straight-line distance from her home to the university is 10.3 km in a direction 25.0 south of east, what was her average velocity in km/h? km/h (c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity in km/h for the entire trip? average speed average velocity km/h km/h A plane lands on a runway with a speed of 115 m/s, moving east, and it slows to a stop in 11.0 s. What is the magnitude (in m/s) and direction of the plane's average acceleration during this time interval? magnitude (Enter a number.) direction due west due east m/s A cheetah can accelerate from rest to a speed of 22.0 m/s in 4.75 s. What is its acceleration (in m/s)? (Enter a number.) m/s