6. If an object accelerates at 3m/s/s, how long does it take for the object to travel at a speed of 12 m/s. ​

4 seconds

Explanation:

Assuming that the object started from rest,

v = at

--> t = v/a = (12 m/s) / (3 m/s^2)

= 4 seconds

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

i think they are all correct

explanation:

they seem good