True or False (5 pts. each) 1. An object can have negative velocity while also h

Question

True or False (5 pts. each) 1. An object can have negative velocity while also having a positive acceleration 2. A projectile has it's smallest speed when it is at the highest point of it's flight. Problems (Show all work) (18 pts each): 1. Which one of the following equations is dimensionally incorrect? s - (vt)2+0.2at2 v- (as Vo2)1/2 Note that s is displacement; v and vo are velocity; a is acceleration; and t is time. 2. Add the following vectors by the method of components. Obtain the magnitude and direction of the resultant: 10 units 60 20 units @ 3000 3. A runner accelerates to a velocity of 4.80 m/sec in 2.5 seconds. If his average acceleration is 0.55 m/sec2 what was his initial velocity when he began accelerating? 4. A truck, traveling at a velocity of 33 m/sec comes to a halt slows down) with an acceleration of 11 m/sec2. How far does the truck travel in the process of stopping? 5. A tennis ball is struck such that it leaves the racket horizontally with a speed of 28.0 m/sec. The ball hits the court at a horizontal distance of19.6 meters from the racket. What is the height of the tennis ball when it leaves the racket?

Explanation / Answer

1. True. It is because of the direction factor only. Consider a case of throwing up a ball.

2. True. It is because the vertical velocity at the top is zero and the object only has a horizontal velocity which is constant throughout the motion. So at all other points there is a vertical velocity associated except in case of the object at top where the vertical velocity is zero and the velocity is purely horizontal and minimum.

As per the Chegg Policy, we can answer only the first question in case of multiple questions. Please repost the other questions for their answers.

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