Question

a car of mass 1000 kg is moving with a certain speed when a constant braking force 1000n

Answer 1

A car of mass 1000 kg is moving with a certain speed when a constant braking force of 1000N acts on it for 5s and the speed of the car reduces to half its original speed.Find the further time required to stop the car, if the same constant force acts.

Answer 2

Answer:

Explanation:

Retardation = Force/mass = 1000 N/ 1000 kg = 1 m/s2

 

in 5 seconds initial speed v0 reduces to (v0/2). thenbegin mathsize 12px style v subscript 0 over 2 equals v subscript 0 cross times 5 space minus space 1 half cross times 1 cross times 25 comma space t h i s space g i v e s space v subscript 0 equals space 25 over 11 end style

now the speed is (25/22) m/s. Required time to stop the car completely is given by

begin mathsize 12px style 0 space equals space 25 over 22 t space minus space 1 half cross times 1 cross times t squared space comma space t h i s space g i v e s space t space equals space 2 3 over 11 space s end style