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,-, ... 1Normal 1NoSpac · Heading 1 Heading 2 Title Paragraph Styles pter 3 Homework . Starting from rest, your car accelerates at a constant rate along a straight path. Your speed is 20 m/s after 1.0 minutes. a. What is your average acceleration during this time? b. How far did you travel during that 1.0 minutes? 2. You throw snowballs down to the sidewalk from the rook of a building. Which technique, if either, makes the snowballs land with more speed: throwing them straight up as hard as you can or throwing them straight down just as hard? (ignore air resistance) Justify your answer mathematically or logically. 3. Draw a motion diagram for a car that starts from rest and accelerates at 5.0 m/s for 6s then travels with a constant speed for 10 s, and the slows to as top with constant acceleration in 4 s In October 1997, a jet-powered car broke the sound barrier reaching a speed of 763 mi/h. To reach this speed, the car accelerated from rest over a 5.0 mile stretch. 4. a. What was the car's average acceleration in this 5-mile stretch? b. Calculate the time interval needed for the car to reach its maximum speed. What is the minimum speed you must throw a ball straight up in order to reach a height of 25 m above the launch position? 5. 6. A particle moves in the x direction according to the equation x(t)-bt'+ct'4d, where b-4.orn/s", c-10m/s' and d=10m. What are its instantaneous velocity and instantaneous acceleration at t-2.0 s? What are its average velocity and average acceleration in the interval t-2.0 s to t-5.0 s? a. b.Explanation / Answer
1)
Given initial velocity u = 0 m/s
final velocity v = 20 m/s
time t = 1 min = 60 s
a)
from the equation v = u + (a * t)
20 = 0 + (a *60)
acceleration a = 0.33 m/s^2----------------------------------------------Answer
b)
displacement s = (u*t) + (1/2 * a * t^2)
s = 0 + (1/2 * 0.33 * 60^2)
s = 594 m----------------------------------------------Answer
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