Calculation Net force on an object
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The most important difference between a wedge and an inclined plane is a. their size b. their shape c. how they are used d. what they are made of

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.