A speeding truck slams on the brakes and accelerates at -7.30 m/s^2. How fast was the truck going before it slammed on the brakes?

your answer would be fusion

ill do it for 100, also this isnt 80 its 40

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