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
[tex]N=m(g-a)\\\\N=300\left(9.8-1.5\right)\\\\N=2490\ N[/tex]
So, the normal force is 2490 N.
