Question

Мяч массой 0,5 кг подбросили вверх , при этом он приобрел потенциальную энергию 25 дж и был в полете 2 секунды найти скорость с которой летал мяч ?кинетическую энергию

Answer 1

Точно не знаю. Правильно ли

Answer 2

Calculation of the Ball's Velocity

To find the velocity with which the ball was flying, we can use the equation for potential energy:

Potential Energy (PE) = mass (m) * acceleration due to gravity (g) * height (h)

Given that the mass of the ball is 0.5 kg and the potential energy is 25 J, we can rearrange the equation to solve for the height:

Height (h) = PE / (m * g)

Substituting the given values:

Height (h) = 25 J / (0.5 kg * 9.8 m/s^2)

Calculating the height:

Height (h) = 5.102 m

Now, we can use the equation for free fall to find the velocity of the ball:

Velocity (v) = g * time (t)

Given that the time of flight is 2 seconds and the acceleration due to gravity is 9.8 m/s^2, we can calculate the velocity:

Velocity (v) = 9.8 m/s^2 * 2 s

Calculating the velocity:

Velocity (v) = 19.6 m/s

Therefore, the ball was flying with a velocity of 19.6 m/s.

Calculation of the Ball's Kinetic Energy

To find the kinetic energy of the ball, we can use the equation:

Kinetic Energy (KE) = 0.5 * mass (m) * velocity^2 (v^2)

Given that the mass of the ball is 0.5 kg and the velocity is 19.6 m/s, we can calculate the kinetic energy:

Kinetic Energy (KE) = 0.5 * 0.5 kg * (19.6 m/s)^2

Calculating the kinetic energy:

Kinetic Energy (KE) = 9.61 J

Therefore, the ball had a kinetic energy of 9.61 J while flying.