Select the words that make the sentence a true statement.
the harder a person hits a tennis ball, the faster it moves. why does the ball move faster?

the acting on the ball is

1. friction or force
2. the same or greater or smaller

An airplane flies eastward and always accelerates at a constant rate. at one position along its path it has a velocity of 34.3 m/s, it then flies a further distance of 40100 m and afterwards its velocity is 47.5 m/s. find the airplane\'s acceleration and calculate how much time elapses while the airplane covers those 40100 m.

=force × distance a. work b. velocity c. pressure d. momentum

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?