Two people are holding up the ends of a 4.25-kg wooden plank. a 6.00-kg box sits in the center of the plank. what forces do the people exert on the plank? hint: the forces of the people must equal the forces acting on the box and the plank.

The forces the people exert on the plank is 100.45N

Explanation:

Force of man 1 on plank =

Force of man 2 on plank =

Gravitational force on plank =

Gravitational force on box =

Given hint is forces of people is equal to forces on plank and box

in the state of equilibrium normal force is equal and opposite to gravitational force.  

initial speed when it is dropped is 150 ft/s

now at the same moment the acceleration due to gravity is perpendicular to its velocity

so as we know that

now we have centripetal acceleration a = 32 ft/s^2 as its perpendicular to velocity

while tangential acceleration at the same moment will be zero

so

now radius of curvature is given as

so the radius of curvature just after it is dropped is 703.125 ft