A 38.5kg man is in an elevator accelerating downward. A normal force of 343n pushes up on him. what is his acceleration?

Explanation:

The acceleration of an object given it's mass and the force acting on it can be found by using the formula

f is the force

m is the mass

From the question we have

We have the final answer as

Hope this helps you

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