PHYSICS HELP!?

Posted on 2015-12-01 07:18:00 in Physics by RICKKI

I really need help with some physics problems! Please go step by step and explain these and tell me what formulas you used and how you got the answers. Thank you so much!

-A car with a mass of 1100 kg moves at 22 m/s. What braking force is needed to bring the car to rest in 20 sec? (neglect external friction)

- A net force of 2000 N acts on a rocket of mass 1000 kg. How long does it take to increase the rocket’s speed from 0 m/s to 200 m/s?

-A snowmobile has a mass of 250 kg. A constant force acts on it for 60 sec. The snowmobile’s initial velocity is 6 m/s and final velocity is 28 m/s. a) What change in momentum does it undergo? b) What is the magnitude of the force that acts on it?

-A car weighing 15680 N and moving at 20 m/s is acted upon by a 640 N braking force until it is brought to a halt. a) What is the car’s mass? b) What is the car’s initial momentum? c) What is the car’s change in momentum? d) How long does the braking force take to stop the car?

-A 7 kg fish swimming at 5 m/s catches and swallows an absent minded 1 kg fish at rest. What is the velocity of the big fish immediately after lunch?

-A minivan (mass 1794 kg) moving at 25 m/s east, hits a mini cooper (mass 1140 kg) at rest. If the 2 vehicles stick together, how fast will they move immediately after the collision?

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