A truck covers 45.0 m in 8.10 s while smoothly slowing down to final speed of 2.60 m/s. (a) Find its original speed. 6.57 The constant acceleration equation involving average velocity, + vyf) might be easiest to use here. m/s (b) Find its acceleration. (Indicate the direction of the acceleration with the sign of your answer.) -0.49 You appear to have correctly calculated the acceleration using your incorrect value from part (a). m/s?

A ball is tossed straight up from the ground. If it reaches the height of your bedroom window (2.0 m) and then falls straight back down to the ground, (g= 9.8 m/s?; Ignore air resistance and use at least 2 significant figures.) 1. What was its initial velocity? 2. How long is the ball in the air?

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Brandi walks 1.90km east to Sam house in 17.0 minutes. They walk together back toward the west 1.25km in 14.5 minutes. What is Brandi average speed for entire trip? What was Brandi average velocity for the entire trip?

A car starts from rest. It accelerates at constant acceleration for 5.0 seconds during which the car covers a distance of 125 m. After that the car continues at that speed for 22 seconds, after which the car slows down at a constant deceleration of – 4.5 m/sec2 until coming to a complete stop. Draw a v vs t, graph, label all the relevant data, and use the graphical method to determine total distance traveled.

If we apply the above equations to the case of an object that does not change its direction of travel as it moves with constant acceleration, we find that the object: Undergoes a displacement Ax = x- x, . Note that displacement is a positive quantity if x > x, and a negative quantity if x < x,. Has average velocity v = (x - x )/t = (v + vo)/2. Note that velocity has the same sign as displacement. Travels distance d = |Ax| = |x – x,| . Note that distance is always a positive quantity. Has average speed d/t . Note that speed is always a positive quantity. Has constant acceleration a = (v – vo)/t . Acceleration may be positive or negative, depending on how velocity changes. - Xo For the case of an object that does change its direction of travel as it moves with constant acceleration, which of the quantities listed above are different? Question

Freight trains can produce only relatively small accelerations and decelerations. a) What is the final velocity of a freight train that accelerates at a rate of 0.0418 m/s² for 6 min, starting with an initial velocity of 3.22 m/s?

A ball is thrown upward from the ground with initial velocity vi = 19 m/s and reaches height of h above the ground before falling back down. Take the upward direction to be positive. Refer to the figure. Neglect air resistance. 1) Enter an expression for the height of the ball at a given time, h, the ball reaches in terms of the velocity at the current height vh, the initial velocity vi, and the acceleration a.  2) Enter an expression for the time it takes for the ball to travel from the ground to the a given height, Δt, in terms of the initial velocity vi, the velocity at that height vh, and the acceleration a.

Ilya and Anya each can run at a speed of 7.60 mph and walk at a speed of 3.50 mph . They set off together on a route of length 5.00 miles . Anya walks half of the distance and runs the other half, while Ilya walks half of the time and runs the other half. a) Find Anya's average speed. b) How long does it take Ilya to cover the distance? (in minutes) c) Now find Ilya's average speed. Thanks

Answers should be in 3 decimal places.   A particle moving in a straight line has an acceleration a = 4t – 9. Its initial velocity is 4m/s. Find the velocity (in m/s) after 6s.