Answer:
N = 2490 N
Explanation:
Determine the upward force exerted by the horizontal platform on the box as it is lowered.
It is given that,
Mass of a box, m = 300 kg
Starting from rest at time t = 0 seconds, the box is lowered with a downward acceleration of 1.5 m/s².
It is assumed to find the upward force exerted by the horizontal platform on the box. It is given by :
mg-N=ma

So, the normal force is 2490 N.
Answer:
Explanation:
Kinetic energy involves motion so something that is not moving has zero kinetic energy.
Potential energy does not involve motion and is based on position in a field like gravity and magnetic.
55.556 mps is your answer!