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1) A ball is thrown vertically upward and is caught by the thrower after 2.00s. find a) initial velocity b) the maximum height it reaches?

a) initial velocity obviously = o, but i have no idea how to find max. height???

2) the driver of a 600kg sports car, heading directly for a railroad crossing 250m away, applies the brakes i a panic stop. the car is moving at 40m/s, and the brakes can supply a friction force of 1200N. a) how fast is the car moving when it reaches the crossing?

- i tried finding the change in time for this, thinking i could then find displacment from that, but it ended up as 2.5hours!!

any help appreciated!!

3) a metre-stick is found to balance at the 29.7cm mark when placed on a fulcrum, when a 50g mass is attached at the 10cm mark the fulcrum must be moved to the 39.2 cm mark for balance. what is the mass of the meter stick?

- just plain stuck on this, tried about 3 different ways of attempting the question, but couldnt find one that suited!! again, any help appreciated!!

:)

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# Maximum height?

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