Every spring has an equilibrium position. which statements describe a spring at its equilibrium position
the spring constant is zero.
the elastic potential energy is at a maximum.
the elastic potential energy is zero.
the displacement of the spring is at a maximum.
the net force acting on the spring is zero.

a=d/t

a="triangle"v/t

explanation:

a = acceleration

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards