Asystem can have a nonzero velocity while the net external force on it is zero. describe such a situation.

Explanation:

According to the Newton's second law of motion

F = m a

where, f be the force , m be the mass and a be the acceleration.

According to the question, F = 0

So, a = 0

a = v - u / t

So, v - u = 0

v = u

That means the velocity is constant.

If a body is moving with constant velocity, its acceleration is zero but velocity is non zero.

For example, a car is moving on a straight track with constant speed and in the same direction is the example in which velocity is non zero but acceleration is zero.

Yes, a system can have a non-zero velocity.

Explanation:

When the net force is zero, applying Newton's second law, the net force is:

F = mass * acceleration

Acceleration can be defined as the change in velocity over time. Since the net force is zero, it also means that the acceleration is zero, since the speed is not changing, but the speed is not equal to zero. If a body moves with a constant velocity other than zero, this body has a net force equal to zero.

answer: the correct answer id option(d).

explanation:

snell's law refraction:

the angle of refraction =

the angle of incidence =

refractive index of air = = 1

refractive index of glycerol = 1.47

from the given options, the most closest answer to 63.72° is 65° of option (d).

overcharge is the right answer system