“rocket man” has a propulsion unit strapped to his back. he starts from rest on the ground, fires the unit, and accelerates straight upward. at a height of 21.0 m, his speed is 5.0 m/s. his mass, including the propulsion unit, has the approximately constant value of 140.0 kg. find the work done by the force generated by the propulsion unit.

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers

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

option number c is the right answer.

+15-35=-20

going in opposite directions