9) A car moving with a speed of 120Km/h along a straight highway and is brought to rest within a distance of 150m. How long does it take for the car to stop? Also, calculate the retardation of the car.
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- A ball is kicked from the ground with an initial speed of 10 m/s at a 50 degree angle with the horizontal. a) Determine the maximum height the ball will reach (in meters) b) Calculate the total flight time of the ball in seconds (from ground back to ground) c) How far (in meters) from the point of the kick will the ball land d) calculate the magnitude of the ball’s velocity just before it hits the ground e) Suppose a house is in the path of the ball and instead of landing on the ground, it lands on the roof (12m high). How long after the kick will the ball collide with the roof?5) Out of frustration for being late to class again, Joe throws his Physics book straight up into the air. If the book leaves Joe's hand moving 20 m/s: A) What is the maximum height, above Joe's hand, that the book attains?Question 28 of 29 6 Points The Pearl Dawn in Durban is one of the tallest buildings in South Africa. You now drop a bullet from the top of the Pearl Dawn while another bullet is shot downward from the same location at an initial velocity of 500 m/s. a) if we neglect air drag, use the how fast method to calculate the final velocity and acceleration each bullet has after 4s. b) how far has the fired bullet traveled after 4s. Explain using words and calculations!! 52
- 12. One of the most important aspects for obtaining a fast bobsled run is the initial push before going downhill. In the two-man bobsled event, the brakeman pushes the back of the sled and the driver pushes from the side. After pushing for 10.0 m they jump in. If they start from rest and achieve a speed of 9.98 m/s when they jump in, determine the magnitude of their acceleration. [4.98 m/s]In which one of the following situations is the observer in an inertial reference frame? a)An astronaut is conducting microgravity experiments aboard the International Space Station. b)A woman is walking at a constant speed down a flight of stairs. c)A NASCAR racer follows the curve at the end of an oval track while moving at constant speed. d)An astronaut is in a rocket that is beginning lift off from the launchpa4. Assume that a ball rolling up on a slanted surface has its displacement along the surface characterized by the following function: s = 1Ot – 5t. The unit of the displacement is meter and the unit of time is second. (a) What is the velocity of the ball at t = 0? (b) What is the acceleration of the ball as a function of time? (c) What is the largest displacement travelled by the ball UP the surface? (d) At what time will the ball return to its position at t = 0? %3D