To answer this question, we will follow these steps: 1- get the volume of cylinder 2- use the density and the volume to get the mass 3- multiply the mass by acceleration due to gravity to get the weight
1- Volume of cylinder can be calculated using the following rule: volume = pi * r^2 * h where: pi is a constant = 3.14 r is the radius = 2.55/2 = 1.275 cm = 0.01275 meters h is the height = 81.5 cm = 0.815 m volume = 3.14 * (0.01275)^2 * (0.815) = 4.16 * 10^-4 m^3
2- Density can be calculated using the following rule: Density = mass / volume mass = density * volume mass = 7800 * 4.16 * 10^-4 = 3.2449 kg
3- To get the weight, multiply the mass by acceleration due to gravity as follows: weight = 3.2449 * 9.8 = 31.8 newtons
The kinetic energy of an object increases as its velocity increases. Moreover, we see that the braking distance of the car increases as its velocity increases. Therefore, the breaking distance increases when the kinetic energy of the car is higher. This is evident in the graph where when the velocity is lower, the kinetic energy is lower and the braking distance is less.