Fill in the Blank
1)Neither( ) nor ( ) of motion changes
A)how fast something moves; an expression of how much time it takes for a change in position to occur; rate of motion; rate of change of position( )
B)The speed of an object in a particular direction; ratio of change in position to time interval over which change takes place.( )
C)quantity having both magnitude and direction( )
D)the separation of two points; the actual distance traveled; a scalar quantity( )
E)speed that does not change( )
F)rate of motion varies( )
G)velocity that does not change over time( )
Velocity,constant speed,average speed,distance,vector quantity,speed,constant velocity
6)A baseball pitcher throws a 30 m/s fastball toward the batter, 20 meters away. The batter hits a line drive right over the pitcher's head into center field. The fielder stops the ball 2 seconds after it is hit, 80 meters from home plate. He hesistates for 2 seconds and then throws the ball at 18 m/s to the second baseman, who catches the ball 2.2 seconds later.
a) How long does it take for the ball to travel to home plate?
b) Find the ball's average velocity on its trip from the batter to the outfielder.
c) Find the distance from outfielder to second base.
7)Two cars are moving at constant velocity to the right. At time = 0, car A is 25 m ahead of car B. Car A has a velocity of 20 m/s and car B has a velocity of 25 m/s. Draw a motion map for the two cars up to time = 10 sec. Explain how you can determine when car B catches up to car A.
1) speed, direction
6a)At 30 meters per second it will take less than one second for the ball to reach the plate....