Question

Тело брошено вверх со скоростью 30м/с какова скорость через 2 секунды

Answer 1

V=V0-gt=30м/с-20м/с=10м/с

Answer 2

Calculation of Velocity after 2 seconds

To calculate the velocity after 2 seconds, we need to know the initial velocity and the acceleration.

From the given information, we know that the body was thrown upwards with an initial velocity of 30 m/s. However, we don't have information about the acceleration.

Let's consider two scenarios:

Scenario 1: Constant Acceleration If we assume that the body experiences constant acceleration, we can use the equations of motion to calculate the velocity after 2 seconds.

The equation for velocity with constant acceleration is:

v = u + at

Where: - v is the final velocity - u is the initial velocity - a is the acceleration - t is the time

Since the body is thrown upwards, we can assume the acceleration due to gravity (-9.8 m/s^2).

Substituting the given values into the equation, we have:

v = 30 + (-9.8) * 2

Simplifying the equation, we get:

v = 30 - 19.6

Therefore, the velocity after 2 seconds, assuming constant acceleration, is -19.6 m/s.

Scenario 2: Free Fall If we assume that the body is in free fall, we can use the equations of motion for free fall to calculate the velocity after 2 seconds.

The equation for velocity during free fall is:

v = u + gt

Where: - v is the final velocity - u is the initial velocity - g is the acceleration due to gravity (-9.8 m/s^2) - t is the time

Substituting the given values into the equation, we have:

v = 30 + (-9.8) * 2

Simplifying the equation, we get:

v = 30 - 19.6

Therefore, the velocity after 2 seconds, assuming free fall, is -19.6 m/s.

Conclusion

Based on the given information, the velocity after 2 seconds is -19.6 m/s. However, please note that this calculation assumes either constant acceleration or free fall. If there are any additional factors or conditions involved, the result may differ.