A car is moving with constant speed of 20m/s. If the engine isapplying a force o

Question

A car is moving with constant speed of 20m/s. If the engine isapplying a force of 150,000 N calculate the opposing force andexplain its nature and direction. If the driver wants to stop thecar and pushes the brake so that a force of 200,000 N is effectiveon the car calculate the acceleration of the car due to brake.Assume the mass of the car is 800 kg. How long will it take for thecar to stop and how far will it go before coming to a completestop? I got this problem wrong on a quiz given in class. I used twoformulas a= F net/m and d = 1/2 at^2 + v t please help! A car is moving with constant speed of 20m/s. If the engine isapplying a force of 150,000 N calculate the opposing force andexplain its nature and direction. If the driver wants to stop thecar and pushes the brake so that a force of 200,000 N is effectiveon the car calculate the acceleration of the car due to brake.Assume the mass of the car is 800 kg. How long will it take for thecar to stop and how far will it go before coming to a completestop? I got this problem wrong on a quiz given in class. I used twoformulas a= F net/m and d = 1/2 at^2 + v t please help!

Explanation / Answer

when the car is moving with uniform velocity the netforce acting on the car = 0 i.e opposing force = -150,000N . since the effective breaking force on the car is, F = 200000N the decelleration of the car                  a = F / m m = mass of the car for the car to come to rest ,if the time taken ist               V = u - at final velocity v = 0 , intial velocity u =20m/sec a = decelleration of the car from above relation we can solve for ' t ' if S be the distance travelled by the car before it come torest in a time ' t ' S =ut -at^2 / 2 . plugging in the knwon values we can sovle for ' S '.    

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