Atruck goes 5 m/s to 25 in 20 seconds. what is the acceleration of the truck during 20-seconds interval? include work

Acceleration = (change in speed) / (time for the change)

Change in speed = (ending speed) - (starting speed)

Change in speed = (25 m/s) - (5 m/s)  =  20 m/s

Time for the change = 20 sec

Acceleration = (20 m/s) / (20 sec)

Acceleration = 1 m/s²

think its the third option

conservation of mass

mass before something happens = mass afterwards