Question

When a constant force is applied to a body it moves with a uniform velocity or uniform acceleration ???

Answer 1

force is directly proportional to acceleration so constant force gives rise to uniform acceleration

Answer 2

When a constant force is applied, the body will move with the constant acceleration.

This is so because of the fact of the correlation between the force applied and the acceleration caused by the force applied which is "directly proportional" to each other and the given statement has been established by the "Newton's second law" of motion.

"Newton's second law" of motion has the mathematical derivation which based on that the F is "directly proportional" to the $\frac{dp}{dt}$

Thereby,

$F=k \frac{dp}{dt}$

Where,

k = 1 in all unit system.

p = Product of mass and velocity.

Therefore,

$F=m \frac{d v}{d t}$

$F=m a$

$F \propto a$

F is directly proportional to a.