A ball weighing 100 g rolls on the floor at a speed of 0.2 m / s. What is its kinetic energy.
September 12, 2021 | education
| 1. Let’s write down the condition of the problem:
m = 100 g
V = 0.2 m / s
E kin. -?
2. Let’s translate all units of measurement into the SI system:
m = 100 g = 0.1 kg
V = 0.2 m / s
E kin. -?
3. Let’s write down the standard formula for calculating the kinetic energy:
E kin. = m × V ^ 2/2
4. Substitute the numerical values from the condition into the formula and calculate the final answer:
E kin. = 0.1 kg × 0.2 m / s ^ 2/2 = 0.1 × 0.04 / 2 = 0.004 / 2 = 0.002 J
5. Let’s translate the resulting number into more convenient units of measurement and write down the answer:
0.002 J = 2 mJ
Answer: 2 mJ
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.