Question

Мяч массой 500г бросили вверх со скоростью 10м/с. Найти кинетическую энергию мяча через 1с.

Answer 1

Дано         |   Решение
m=0.5кг    |   U=Uo-gt
Uo=10м/c |   U=0м/c
t=1c          |    Eк=(mU^2)/2 = 0
--------------|   Ответ: Eк= 0
Eк-?          |

Answer 2

Calculation of Kinetic Energy

To find the kinetic energy of the ball after 1 second, we need to calculate the change in kinetic energy using the formula:

Kinetic Energy (KE) = (1/2) * mass * velocity^2

Given: - Mass of the ball (m) = 500g = 0.5kg - Initial velocity (v) = 10m/s

Let's calculate the kinetic energy of the ball after 1 second.

Step 1: Calculate the final velocity (v') after 1 second using the formula:

Final velocity (v') = Initial velocity (v) - g * t

Where: - g is the acceleration due to gravity (approximately 9.8m/s^2) - t is the time (1 second)

Using the given values, we can calculate the final velocity:

v' = 10m/s - (9.8m/s^2 * 1s) = 10m/s - 9.8m/s^2 = 0.2m/s

Step 2: Calculate the kinetic energy (KE') of the ball after 1 second using the formula:

Kinetic Energy (KE') = (1/2) * mass * velocity'^2

Substituting the values:

KE' = (1/2) * 0.5kg * (0.2m/s)^2 = 0.02 Joules

Therefore, the kinetic energy of the ball after 1 second is 0.02 Joules.

Please note that the above calculation assumes no external forces acting on the ball during its motion.