Question

a body of mass 2 kg is sliding with a velocity of 4 m per second on a frictionless horizontal surface a retarding force necessary to stop it the object in one second is

Answer 1

Step-by-step explanation:

According to the Newton’s law of inertia (Newton’s First Law of Motion) the body can move with a constant speed only if it is acted upon by the balanced forces.

In this question as the body of 2 kg is sliding with a constant velocity the gravitational pull of the earth on it is balanced by the opposing force (friction). So the force balancing the gravitational pull of the earth is equal to its weight = 2 ⨯9.8 N = 19.6 N

Answer 2

hey

Since body is moving with constant velocity, so acceleration of the body is zero. Hence no force is acting on the body and in the absence of external force body will keep on moving with same speed according to law of inertia so no force is required to keep the body in uniform motion.