What was the initial speed of a car if its speed is 40 m/s after 5 seconds of accelerating at -4 m/s2? a. 20 m/s b. 50 m/s c. 60 m/s d. 25 m/s

Will you chech and finish these for me, because i am stumped with them.

Ineed asap! list 3 examples in which friction us or makes things easier in our daily life. explain the effect of friction for each. *make sure you explain the effect of friction for each example! *

Agas contained within a piston-cylinder assembly undergoes three processes in series: process 12: compression with pv= constant from 1 bar and 1 liter to 4 bar. process 23: constant pressure expansion to 1 liter. process 31: constant volume calculate the pressure and volume at each state, and sketch the processes on a p-vdiagram labeled with pressure and volume values at each numbered stat