A 5 kg object is dropped from the top of a 40 m tall building. What is its initial potential energy? What is its velocity the instant it hits the ground? What is its velocity after it has fallen 25 m?

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 are the similarities & differences between a thermistor and a light dependent resistor in physics?

1kg of water needs to recieve 4200j of energy to go from 90 degrees to 91 degrees. what is the specific heat capacity of water? what are the units?