2. A helicopter blade spins at exactly 115 revolutions per minute. Its tip is 4.50 m from the center of rotation.

(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

3. A commuter backs her car out of her garage with a constant acceleration of 1.20 m/s².

(a)How long in seconds does it take her to reach a speed of 2.30 m/s? ---s

(b)If she then brakes to a stop in 0.8 s, what is her (constant) deceleration in m/s²? -----m/s²

4. A well-thrown ball is caught in a well-padded mitt. If the deceleration of the ball is 2.50 10⁴ m/s², and 1.79 ms (1 ms = 10³ s) elapses from the time the ball first touches the mitt until it stops, what was the initial velocity (in m/s) of the ball? (Enter the magnitude.) ----m/s

5. Calculate the displacement in m and velocity in m/s at the following times for a rock thrown straight down with an initial velocity of 14.2 m/s from the Verrazano Narrows bridge in New York City. The roadway of this bridge is 70.0 m above the water. (Enter the magnitudes.)

(a)0.500 s

displacement--- m

velocity--- m/s

(b)1.00 s

displacement ---m

velocity---- m/s

(c)1.50 s

displacement ---m

velocity ----m/s

(d)2.00 s

displacement ---m

velocity ----m/s

(e)2.50 s

displacement --- m

velocity ----m/s