Atrain moves forward at a constant speed. what is true about the forces
acting on the train? sc. c.2.3.6
a. the forward forces are equal to the forces acting in the backward
direction.
b. the forward forces are greater than the forces acting in the backward
direction.
c. the forward forces are smaller than the forces acting in the backward
direction.
d. there can never be any force acting on the train when it moves at a
constant speed.

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

What is the mass of the same rock on the earth

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. the work done on object 1 is 900 j. after the force has pulled each object, object 1 moves twice as fast as object 2. how much work is done on object 2?