Answer
2411 Pa
Work Step by Step
Let's apply Newton's second law in the vertical direction to the suitcase to find the upward force that the floor exerts on the suitcase.
$\uparrow F=ma$ ; Let's plug known values into this equation.
$R-16\space kg\times9.8\space m/s^{2}=16\space kg\times1.5\space m/s^{2}$
$R=180.8\space N$
Pressure on the elevator floor $=\frac{R}{Area}=\frac{180.8\space N}{(0.15\space m)(0.5\space m)}\approx2411\space Pa$
