Amarble is flicked off the edge of a table. the motion of the marble follows a parabolic path.

which is true about the motion of this marble?

a.
only one continuous force is acting on the marble.

b.
two continuous forces are acting on the marble.

c.
no continuous forces are acting.

d.
two instantaneous forces are acting on the marble.

When marble is flicked off the edge of a table then the at the instant it will move off the table the velocity is horizontal while due to force of gravitation the marble will start accelerating downwards.

So here we will say that the velocity of marble will remain constant through out the motion in X direction as there is no force in that direction

While in Y direction the marble will have gravitational force due to which marble will accelerate downwards

So the path of the marble will be parabolic path

hence the correct answer will be

A.

Only one continuous force is acting on the marble.

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle