Part A:
For this part we’re assuming all the kinetic energy of the moving bumper car is converted into elastic potential energy in the spring since the car is brought to rest. Therefore you can find the total kinetic energy to get your answer:
KE = ½ mv^2
KE = ½ (200)(8)^2
KE = 6400 J
Part B:
Now you can use Hooke’s law to find the force:
F = kx
F = (5000)(0.2)
F = 1000 N
The buoyant force exerted by a liquid is equal to the weight of the fluid <span>displaced.</span>
Answer:

Explanation:
According to Newton's Second Law of Motion, force is the product of mass and acceleration.

The mass of the stone is 0.2 kilograms and the acceleration is 10.0 meters per square second.
Substitute the values into the formula.

Multiply.

Convert the units.
- 1 kilogram meter per square second (kg*m/s²) is equal to 1 Newton (N)
- Our answer of 2 kg*m/s² is equal to 2 N

The force is <u>2 Newtons.</u>