Question

Мячик при скорости 10м/с обладает кинетической энергией в 5Дж.Какой будет кинетическая энергия мячика при скорости 20м/с?

Answer 1

Ответ 20 ДЖ так как


Е2\Е1= mV2^2\mV1^2\= (20\10)^2=4

E2=4*E1=20 Дж

Answer 2

Дано: Ек1=5 Дж; V1=10м/с; V2=20 м/с; Ек2 - ?

Ек1=mV1^2/2=(m/2)*10^2=5 Дж;

Ек2=mV2^2/2=(m/2)*20^2=(m/2)*(10*2)^2={(m/2)*10^2}*4=Ек1*4=5*4=20 Дж.

При увеличении скорости в 2 раза кинетическая энергия тела увеличилась в 4 раза.

Answer 3

Kinetic Energy Calculation

To calculate the kinetic energy of an object, we can use the formula:

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

Given that the kinetic energy of a ball at a velocity of 10 m/s is 5 J, we can use this information to find the kinetic energy of the ball at a velocity of 20 m/s.

Let's assume the mass of the ball remains constant.

Using the formula, we can calculate the kinetic energy at a velocity of 20 m/s:

KE = 0.5 * mass * (20 m/s)^2

To find the kinetic energy at a velocity of 20 m/s, we need to know the mass of the ball. Unfortunately, the mass of the ball is not provided in the question. Without the mass, we cannot calculate the kinetic energy at a velocity of 20 m/s.

If you have the mass of the ball, please provide it, and I will be happy to help you calculate the kinetic energy at a velocity of 20 m/s.