6. The graph given represents the motion of a fast moving car. What can you conclude about the motion of the car?*
80
60
Velocity (m/s)
401
201
OH
5 10 15 20
Time (s)
O A. The car is moving with uniform acceleration.
O B. The car has positive acceleration, followed by a negative acceleration.
C. The car accelerates, then moves with constant speed
O D. The car has a negative acceleration, followed by a positive acceleration

Abatter hits the baseball a with an initial velocity of v0 = 110 ft/sec directly toward fielder b at an angle of 23° to the horizontal; the initial position of the ball is 2.2 ft above ground level. fielder b requires 0.44 sec to judge where the ball should be caught and begins moving to that position with constant speed. because of great experience, fielder b chooses his running speed so that he arrives at the “catch position” simultaneously with the baseball. the catch position is the field location at which the ball altitude is 8.4 ft. determine the velocity of the ball relative to the fielder at the instant the catch is made.

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

The key to stability is feedback between the reservoir and the fluxes into and/or out of the reservoir. assume that the rate of outflow from a reservoir depends on the size of the reservoir according to the following relationship: outflow rate= k x (size of reservoir), where k is a constant. a reservoir of water has a volume of 5000 liters, and the rate of outflow at steady state is 25 liters per minute. what is k? (give both the numerical value and its units.) what is the residence time? what is the relationship between k and the residence time?