Explanation:
Given that,
Mass of the person, m = 72.5 kg
Initial speed of the car, u = 20.5 m/s
(a) Let 
is the horizontal component of the average force, in newtons, on the person if he is stopped by a padded dashboard that compresses an average of 1.15 cm, x = 0.0115 m and v = 0
Using the second law of motion to find it as:
Using the third equation of kinematics to find a.
(b) Here, x = 13.5 cm = 0.135 m
Hence, this is the required solution.
A, both potential and kinetic energy as mechanical energy is the sum of potential and kinetic energy.
Answer:
A pair of scissors used to cut a piece of cloth has blades longer than the handles so that the blades move longer on the cloth than the movement at the handles.
While shears used for cutting metals have short blades and long handles because as it enables us to overcome large resistive force by a small effort.
Answer:
A researcher seeks to prove that babies smile at two months old. She counts some confused expressions as smiles.
Explanation:
This is the answer because its not actual date due to the fact she's using her opinion to decided whether or not the expression a baby is making is a smile, whereas the other answers had factual data involved.
