The figure shows the acceleration vector a at several points along an object's curved trajectory. At each point, the dashed line is perpendicular to the trajectory. 2 O Macmillan Learning 1 127 13 3 --- 4 At which point or points is the object speeding up? Select all that apply. point 1 point 3 point 2 point 4

(a) A daredevil is attempting to jump his motorcycle over a line of buses parked end to end by driving up a 32° ramp at a speed of 40.0 m/s (144 km/h). How many buses can he clear if the top of the takeoff ramp is at the same height as the bus tops and the buses are 20.0 m long? (b) Discuss what your answer implies about the margin of error in this act—that is, consider how much greater the range is than the horizontal distance he must travel to miss the end of the last bus. (Neglect air resistance.)

Q4

If a baseball player can throw a ball a maximum distance of 200 ft over the ground. What is the maximum vertical height to which he can throw it? Assume the ball to have the same initial speed in each case. A. 40 ft C. 60 ft B. 25 ft D. 50 ft

You're 6.0 m from one wall of a house. You want to toss a ball to your friend who is 6.0 m from the opposite wall. The throw and catch each occur 1.0 m above the ground. (Figure 1) Assume the overhang of the roof is negligible, so that you may assume the edge of the roof is 6.0 m from you and 6.0 m from your friend. Figure 3.0 m 11.0 m 6.0 m 45° 6.0 m 6.0 m 1 of 1

6. Josh kicks a soccer ball with an initial vertical velocity of 12 m/s and an initial horizontal velocity of 20 m/s when it leaves his foot. The ball experiences a constant vertical acceleration of 9.81 m/s? downward while it is in the air. a. What is the ball's horizontal velocity 2s after it leaves Josh's foot? b. What is the ball's vertical velocity 2 s after it leaves Josh's foot?

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1. A lizard kicks a ball with an initial velocity of 10 m/s at an angle of 35 degrees with the horizontal. a. What are the horizontal and vertical components of the initial velocity? b. What is the total time the ball is in the air? c. What is the maximum height of the ball?

A smart ball, with a speedometer, is kicked with an initial speed of 37.0 m/s, then follows a projectile trajectory as shown. The speedometer recorded that the ball's lowest speed along its trajectory (at the highest point) is 28.0 m/s. What is the ball's initial launch angle measured in degrees? Origin y L