What is the sum of the forces in an action reaction pair?
a.
always less than zero
always greater than zero
b.
always equal to zero
sometimes less than zero
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Madison pushes with a 210-n horizontal force on a 24-kg crate of coffee resting on a warehouse floor. the force of friction on the crate is 74 n. what is the acceleration?

Two charged particles, q1 and q2, are located on the x-axis, with q1 at the origin and q2 initially at x1 = 12.2 mm. in this configuration, q1 exerts a repulsive force of 2.62 µn on q2. particle q2 is then moved to x2 = 18.0 mm. what is the force (magnitude and direction) that q2 exerts on q1 at this new location? (give the magnitude in µn.)

Aproton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?