Question

Мяч массой 300г движется с постоянной скоростью 2м/с и ударяется о стенку после чего движется обратно с такой же по модулю скоростью. Определите изменение импульса мяча

Answer 1

равняться 0, так как ни маса, ни скорость не изменились.

Answer 2

Изменение будет равняться 0, так как ни маса, ни скорость не изменились.

Answer 3

Calculating Change in Momentum of the Ball

To calculate the change in momentum of the ball, we can use the formula for momentum, which is given by:

Momentum (p) = mass (m) × velocity (v)

The change in momentum can be calculated using the initial and final momentum of the ball.

1. Initial Momentum (p_initial): - Mass (m) = 300g = 0.3kg - Initial velocity (v_initial) = 2m/s - Using the formula, initial momentum (p_initial) = m × v_initial

2. Final Momentum (p_final): - The ball moves back with the same speed, so the final velocity (v_final) = -2m/s (negative sign indicates the opposite direction) - Using the formula, final momentum (p_final) = m × v_final

3. Change in Momentum: - Change in momentum = p_final - p_initial

Let's calculate the change in momentum using the given values.

Using the given mass and velocities, we can calculate the change in momentum of the ball.

Initial Momentum (p_initial): - m = 0.3kg - v_initial = 2m/s - p_initial = 0.3kg × 2m/s = 0.6 kg m/s Final Momentum (p_final): - v_final = -2m/s - p_final = 0.3kg × (-2m/s) = -0.6 kg m/s Change in Momentum: - Change in momentum = p_final - p_initial - Change in momentum = (-0.6 kg m/s) - (0.6 kg m/s) = -1.2 kg m/s

Therefore, the change in momentum of the ball is -1.2 kg m/s.