The hammer has a mass of 1800 kg. Its velocity is 5 m/s just before it hits the post. How much potential has the hammer lost as it falls assume it falls freely

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

Due in 40 explain in terms of frame of reference if you’re inside a moving train everything on the outside can seem to be moving