A tennis ball is projected with a velocity of 3ms-¹ at an angle of 30 to the horizontal calculate the time of flight in seconds take g=9.8ms-²

What are two different ways you could find the value of a? explain these methods.

An insulated thermos contains 148 g of water at 72.7 ˚c. you put in a 11.7 g ice cube at 0.00 ˚c to form a system of ice + original water. the specific heat of liquid water is 4190 j/kg•k; and the heat of fusion of water is 333 kj/kg. what is the net entropy change of the system from then until the system reaches the final (equilibrium) temperature?

If you held a stone over the mouth of a well and then let it go , what would happen to the stone? explain your answer.