What boat – weighing 150 kg or 300 kg – when jumping from it, a person moves backward with a higher speed?
| September 19, 2021 | education
What boat – weighing 150 kg or 300 kg – when jumping from it, a person moves backward with a higher speed? a) the first with a speed 2 times higher; b) the second with a speed 2 times higher; c) both with the same speed; d) there is not enough data to answer.
To find a boat that should move back faster, we will use the ratio (we use the law of conservation of momentum: mh * Vh = Vlx * mlx): Vl1 / Vl2 = (mh * Vh / ml1) / (mh * Vch / ml2) = ml2 / ml1.
Values of variables: ml2 – mass of the second boat (ml2 = 300 kg); ml1 is the mass of the first boat (ml1 = 150 kg).
Calculation: Vl1 / Vl2 = ml2 / ml1 = 300/150 = 2 p.
Answer: a) the first with a speed 2 times higher.
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