A150-kg object takes 1.5 minutes to travel a 2,500-meter straight path. it begins the trip traveling 120 m/s and decelerates to a velocity of 20 m/s. what was its acceleration? a. -1.11 m/s2 b. -0.3 m/s2 c. +1.11 m/s2 d.+80 m/s2

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

read more on -

the five characteristics of adolescence are biological growth and development, and undefined status, increased decision making, increased pressure and the search of self.