What volume of alcohol with a density of 8.4x10² will have the same mass as 4.2m³

moving up positive acceleration

Explanation:

when moving up as you bounce the ball

the speed changes gradually increasing so according to the equation

acceleration =[speed change ] ÷ period when speed change is positive acceleration is also positive , and an greater value

example speed changes 5m/s within 2 seconds throwing the ball upward

(these are assuming values to explain)

acceleration is 5/2 = + 2.5 m/s^2

so this is an positive acceleration

if negative we call deceleration