4 for sure because you dont want anything spilling on you or others that is harmful.
Answer:
a scientist examines the results and answers the lab question- last choice
Acceleration = Change in Velocity / time
a = (v - u) / t
Where v = final velocity in m/s
u = initial velocity in m/s
t = time in seconds.
a = acceleration in m/s²
A proper record of the changes in velocity with the corresponding time would help find the acceleration.
Chemical energy is transformed in your body
