Find the mass of a body if it moves at a speed of 72 km / h, and its impulse is 80 kg * m / s

As we know from the school curriculum in physics, the momentum of the body can be calculated using the following formula:

p → = m * V →, where m is, in fact, the mass of the body, and V → is its speed.

Let us determine what value the mass of the specified body will equal, if from the condition of our problem we know for sure that at a speed of 72 km / h, its impulse was 80 kg * m / s:

m = p → / V →;

Let’s give the speed to m / s:

72 km / h = 72 * 1000: 3600 = 20 m / s;

80: 20 = 4.

Answer: Under such conditions, the body weight is 4 kg.