A boat crosses a 200m wide river at 3m/s ,north relative to water. the river flows at 1 m/s as shown . what is the velocity of the boat as observed on the river back from the boat departed

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?

What is the temperature in degrees celsius of a substance with a tempature of 49k

Ablock having mass m slides down an inclined plane. the force of friction between the block and the inclined plane is f, the block's weight is m g, and the normal force is n. (a) draw a free – body force diagram showing the forces acting on the block. (b) write down all relevant newton’s equations for a given situation.