Question

an object moving along a straight line.first it travels at a velocity of 12m/s for 5s and then continue at the same direction with 20m/s for 3s.what is its average speed​

Answer 1

Step-by-step explanation:

Initial velocity of the object       vi=+12 m/s    (positive direction)

Final velocity of the object        vf=−12  m/s    (negative direction)

Thus acceleration of the object       a=tvf−vi=4−12−12=−6  m/s2

Answer 2

Answer:

hope it helps good night