A father, mass 80 kg, and his son, mass 40 kg, are standing on a frozen, frictionless pond. That means there is no friction. None! They are a distance apart and they are each holding onto a rope and starting a tug of war. They both pull with a constant nonzero force. Which of the following best describes the motion of the boy? A) Constant speed.
B) Constant velocity.
C) Constant acceleration.
D) They remain at rest.

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

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

statement #3 on andre"s list is false.

answergravity;