Question

Чему равна кинетическая энергия тела массой 3 кг, движущегося со скоростью 4 м/с на высоте 2м от поверхности земли?Ускорение силы тяжести принять равной 10м/c^2?

Answer 1

E=mv^2/2=3*4^2/2=24 дж

Answer 2

Calculation of Kinetic Energy

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

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

Given: - Mass of the object (m) = 3 kg - Velocity of the object (v) = 4 m/s

Using the given values, we can calculate the kinetic energy of the object:

KE = (1/2) * 3 kg * (4 m/s)^2

Let's calculate the value of KE:

KE = (1/2) * 3 kg * 16 m^2/s^2

KE = 24 J

Therefore, the kinetic energy of the object with a mass of 3 kg and a velocity of 4 m/s is 24 Joules.

Calculation of Potential Energy

To calculate the potential energy of an object at a certain height, we can use the formula:

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

Given: - Mass of the object (m) = 3 kg - Acceleration due to gravity (g) = 10 m/s^2 - Height from the surface of the Earth (h) = 2 m

Using the given values, we can calculate the potential energy of the object:

PE = 3 kg * 10 m/s^2 * 2 m

PE = 60 J

Therefore, the potential energy of the object with a mass of 3 kg and at a height of 2 m from the surface of the Earth is 60 Joules.

Please let me know if there's anything else I can help you with!