Question

Car speed!80km/hr and distance stopped=60metre what is the decleration of the car metre/sec²?

Answer 1

Here final velocity is 0 m/s
and initial is 80km/hr so will convert this in m/s so its velocity in m/s is 80×(5/18)m/s now applying 3rd formula that is
${v}^2 = {u}^{2} + 2as$
so 0=(200/9)^2 +2a×60
-(40000÷81)/60=2a
-(2000/243)=2a
so a= -(1000/243)
a= -4.115 m/s^2
Here minus sign represents deceleration