3. The following equations give the position x(t) of a particle in four situations (in each equation, x is in meters, t is in seconds, and t> 0): (1) x = 3t - 2;(2) x =-4t° - 2; (3)x = 2/t;and (4) x =-2.(a) In which situation is the velocity v of the particle constant? (b) In which is v in the negative x direction?

3. The following equations give the position x(t) of a particle in four situations (in each equation, x is in meters, t is in seconds, and t> 0): (1) x = 3t - 2;(2) x =-4t° - 2; (3)x = 2/t;and (4) x =-2.(a) In which situation is the velocity v of the particle constant? (b) In which is v in the negative x direction?