Question

c) 353 J 13. A 200 kg roller coaster starts from 50 m above the ground. (a) 5 It falls toward the ground with out any friction then once it ((c) reaches the ground level, the brakes are applied over 30 m 19. A in order to bring the coaster to a complete stop. How much ms-1 work is done by the brakes? 20 N (a) 10 x10 J (c)-10 x10 J 14. A 7 kg ball is dropped from 20 m. If the speed just before (c) 3 it hits the ground is 18 ms-1 , what is the work done by air 20.Th (b) 10x105 J (d) -10 x105 J stops resistance? (a) 266 J (c) -13 J 15. A 1000 kg car traveling at 60 kmhr1 hits a stationary (a) 4.2 stop f kineti mately (b) 13 J (d) -266.J truck weighing 20,000 N. If the truck has a velocity of 1 ms 5.1 after the crash, what is the velocity of the car after the crash? 21. A (a) 14.5 ms- in the same direction it was initially traveling. force p (b)14.5 ms in the opposite direction it was initially travel- , be ing (0)19 ms-1 in the same direction it was initially traveliug. the blos (d) 19 ins- in the opposite direction it was initially travel- (a)16 ing 16. A box of mass m is sitting on an incline of 450 and it Questi requires an applied force F up the incline to get the box to A block begin to move. What is the maximum coeticient of static to an o nitude (c) 4.01

Answer 1

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