Question

if the initial velocity of a car is 25m/s.when braek is given it stops with in 2sec.what is its acceleration???

Answer 1

According to eq.1 of motion,

v= u+at

From this,

=> a = v-u/t

=> a = 0 - 25/2

=> a = -25/2

=> a = -12.5 m/s^2

Answer 2

GIVEN,

INITIAL VELOCITY,u = 25m/s

FINAL VELOCITY ,v = 0

TIME = 2s

NOW,

ACCELERATION= (FINAL VELOCITY - INITIAL VELOCITY)/TIME

                          = 0-25/2

                          =-12.5m/s²