a book is pushed with an ninitial horizontal velocity of 5.0 meters per second off the top desk. What is the initial vertical velocity of the block

a electromagnetic waves

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle

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

there are no contact forces mentioned on the list of choices that you've provided.