All i know is
- baking soda
-lemon
-vinegar
-bleach
Answer:
the branch of mechanics concerned with the motion of objects without reference to the forces which cause the motion is called kinematics.
In order to know how long it has been falling for you take the final velocity "49m/s" and divide it by the acceleration "9.8m/s" and get 5, since you have been using seconds in the calculations the answer is 5 seconds. (Fun fact, it is actually 9.82m/s per second since it accelerates and they rounded it down.)
Answer: P= W/t so P=50/20 =2.5 W
