If a mass is undergoing constant increase in velocity, you can say that:?

Question

A. The forces on it are balanced
B. There is a constant resultant force acting
C. The resultant force acting on it decrease with time
D. The resultant on it increase with time

Explanation please...

Answer 1

b.

force is proportional to acceleration. (f=ma)

the acceleration is constant, and not zero, so the force is constant, but not balanced.

Answer 2

B. Here's why.

A. The forces on it are balanced

False, dv/dt > 0 meaning the mass m is accelerating at a constant rate. Thus, f = m dv/dt = m a as dv/dt = a > 0.

B. There is a constant resultant force acting

True, given is dv/dt > 0; therefore f = m dv/dt > 0, which is a constant force greater than zero.

C. The resultant force acting on it decrease with time

False, from B, we saw that f > 0, the force is always positive; so it does not "decrease with time."

D. The resultant on it increase with time

False, again from B, f > 0 means its greater than zero, but fixed at that level, whatever it turns out to be.

Answer 3

B.
acceleration is constant, so force is constant.