A student lifts their 5 kg backpack 2 meters off the floor. How much work does the student do on the backpack? 5/2= 2.5 J
5 x 2 = 10 W
5/2 = 2.5 W
5 x 2 = 10 J

Which statement correctly describes the relationship between frequency and wavelength?

22. the effect of threshold braking is to a cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

James is trying to prove newton's 2nd law of motion. he tries to move four different objects with different masses, shapes, and sizes from point a to point b. the objects are a toy car, a car, a refrigerator, and a kitchen table. after some experimentation, he finds that force is dependent on the mass of the object, rather than it's size or shape. the object that takes the most force to move is the