Physics Homework- Urgent!!!! :(?

Posted on 2014-04-22 07:10:00 in Physics by SUPERCHEF

Hi I'm really stuck on Physics- especially momentum and collisions, please can you help me with some questions:



Q4) 750kg car travelling at 30m/s along motorway. Crashes into barrier and stopped in a period of 1.2 seconds-- find the size of the average force acting on the car to stop it



Q6) 0.15kg cricket ball dropped vertically onto a floor. It hits the floor at speed of 10 m/s and bounces vertically back up at the same speed. If the ball is in contact with the floor for 0.02s, what is the average force exerted on it?



++ Q3) Dummy dropped 60m from top of building. The dummy's weight is 950N. Assume that g= 10m/s(2)

a) calculate mass of dummy

b) how much gravitational potential energy does the dummy have before dropped

c) How much kinetic energy will the dummy have when it reaches the ground- ignore the effect of air resistance

d) calculate the dummy's speed as it hits the ground



PLEASE SOMEBODY HELP IT'S REALLY URGENT, MY HEAD IS KILLING ME ;( ;(

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