Question

Груз поднимают лебедкой. Первые 2 с груз движется без начальной скорости с ускорением 0,5 м/с2 , следующие 11 с – равномерно, последние 2 с – равнозамедленно с ускорением 0,5 м/с2 . На какую высоту был поднят груз? помогите пожалуйста

Answer 1

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

Answer 2

Calculation of the Height the Load was Raised

To calculate the height the load was raised, we can break down the motion of the load into three phases: the first 2 seconds with an initial acceleration of 0.5 m/s^2, the next 11 seconds with uniform motion, and the final 2 seconds with a deceleration of -0.5 m/s^2.

Let's calculate the distance traveled during each phase and then sum them up to find the total height the load was raised.

1. Phase 1: First 2 seconds with an acceleration of 0.5 m/s^2 During this phase, we can use the equation of motion: s = ut + (1/2)at^2, where: - s is the distance traveled - u is the initial velocity (which is 0 in this case) - a is the acceleration - t is the time

Plugging in the values, we get: s1 = 0 * 2 + (1/2) * 0.5 * (2^2) s1 = 0 + 0.5 * 2 s1 = 1 meter

2. Phase 2: Next 11 seconds with uniform motion During this phase, the load moves with a constant velocity, so the distance traveled can be calculated using the equation: s = vt, where: - s is the distance traveled - v is the velocity - t is the time

Since the load moves with a constant velocity, the distance traveled is simply the product of the velocity and time: s2 = v * t s2 = v * 11

Unfortunately, the search results did not provide the necessary information to determine the velocity during this phase. Could you please provide the velocity of the load during the uniform motion phase?

3. Phase 3: Last 2 seconds with a deceleration of -0.5 m/s^2 During this phase, the load decelerates with an acceleration of -0.5 m/s^2. We can use the same equation of motion as in phase 1 to calculate the distance traveled: s3 = 0 * 2 + (1/2) * (-0.5) * (2^2) s3 = 0 + (-0.5) * 2 s3 = -1 meter

Now, let's sum up the distances traveled during each phase to find the total height the load was raised: Total height = s1 + s2 + s3

Please provide the velocity during the uniform motion phase so we can complete the calculation.