Question

while driving on level road at 72km/h,ankit observes the traffic signal turning red the white stopping line being 52 m awayfrom the front end of this car.immediately he applies the break that declarates his car at 4m/s *2 .how far from the stopping line will the front end of ankit car be after 6 second​

Answer 1

Answer:

2 mtr

Explanation:initial velocity of the car = 72 km/hr or 20 m/sec

acceleration= -4 m/s² time = 6 sec

so , s=ut+1/2at²

=20(6)+1/2(-4)(36)

=48

in 6 sec car will travel 48 m and initial dist was 50 mtr from stopping line so now at t=6 car will be 2 mtr away from stopping line