A person weighing 80 kg jumps into a stationary boat weighing 120 kg at a speed of 5 m / s.
| August 8, 2021 | education
A person weighing 80 kg jumps into a stationary boat weighing 120 kg at a speed of 5 m / s. How fast will the boat start to sail?
Initial data: mh (human weight) = 80 kg; ml (mass of a stationary boat) = 120 kg; Vh (speed of a person at the time of jumping into the boat) = 5 m / s.
The speed at which the boat will start to sail can be determined by the formula (law of conservation of momentum): mh * Vh = (mh + ml) * V, whence V = mh * Vh / (mh + ml).
Let’s make the calculation: V = 80 * 5 / (80 + 120) = 2 m / s.
Answer: After a person has jumped, the boat will begin to move at a speed of 2 m / s.
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.
