Question

Кинетическая энергия тела равна 20 Дж, а его скорость 10 м/с. найдите массу тела.

Answer 1

K=20 Дж           кинетическая энергия:
v=10 м/с                 K=mv²/2  ⇒  m=2K/v²;
__________           m=2*20/100=4 кг;
m-?                         Ответ: m=4 кг.

Answer 2

Calculation of the Mass of the Object

To find the mass of the object, we can use the formula for kinetic energy:

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

Given that the kinetic energy of the object is 20 J and its velocity is 10 m/s, we can substitute these values into the formula and solve for the mass:

20 J = (1/2) * mass * (10 m/s)^2.

Let's calculate the mass using this equation:

(1/2) * mass * (10 m/s)^2 = 20 J.

Simplifying the equation:

mass * (10 m/s)^2 = 40 J.

mass * 100 m^2/s^2 = 40 J.

mass = 40 J / (100 m^2/s^2).

mass = 0.4 kg.

Therefore, the mass of the object is 0.4 kg.

Answer

The mass of the object is 0.4 kg.