Which of the following are examples of velocities? a. +54 m/s. b. 60 miles/hour. c. 70 miles/hr northeast. d. -100 m/s. e. 20 knots. f. a, c, d. g. b, e.

4. A bullet fired horizontally from a gun is travelling at 250 m/s. The velocity of the bullet at any time t, in seconds, can be represented by v(t)=250-2t³. Assume the bullet is affected by air resistance but not gravity. How long will the bullet be in the air before it stops due to air resistance? a. b. How far will the bullet travel before it stops? Record your answer as an exact value.

An FBI Tactical Operations Team agent uses a high tech sling shot to launch an object from the roof of Building A. She hopes that the object will land on the roof of Building B. There is a 5.00 m wide alley between the two buildings, as shown in the figure. At the instant of its launch, the object has an initial velocity of 6.72 m/s directed 30 degrees above the horizontal. At the instant of its launch, the object is located 0.400 m above the roof of Building A, at a horizontal distance of 0.500 m from the edge of Building A, and 2.00 m above the level of the roof of Building B, as shown in the Figure. Treat the object as a point g = 9.80m 2. particle. Assume that air resistance is negligible, although it would not be. Assume that The near side of Building B 30° 0.400 m | 2.00 m b.500 m 5.00 m Alley 1. How much time does it take the object to reach the highest point in its trajectory? A. 0.594 s. B. 0.686 s. C. 0.859 s. D. 0.343 s. E. 0.561 s. 2. At the instant when the object passes…

10.A kangaroo is capable of jumping to 250 cm height. Determine time taken in jump and takeoff speed of the kangaroo.