Question

Find the acceleration of the body during AB, BC, and CD.

• A. 3.33 $m/s^2$ , 0 $m/s^2$ , 7.5 $m/s^2$
• B. 7.5 $m/s^2$ , 0 $m/s^2$ , - 3.33 $m/s^2$
• C. 3.33 $m/s^2$ , 0 $m/s^2$ , - 7.5 $m/s^2$
• D. -7.5 $m/s^2$ , 0 $m/s^2$ , 3.33 $m/s^2$

Answer 1

The correct option is C 3.33 $m/s^2$ , 0 $m/s^2$ , - 7.5 $m/s^2$

Acceleration = Rate of change of velocity/Time​

Acceleration AB = (15 m/s -5 m/s)/3 s = 3.33 $m/s^2$

Acceleration BC = (15 m/s -15 m/s)/2 s = 0 $m/s^2$

Acceleration CD = (0 m/s - 15 m/s)/2 s = - 7.5 $m/s^2$