Question

the vetocity of a bike which is stopped in 10 seconds by applying brakes the retardation due to brakes is 2.5m/s

Answer 1

v=u+at
v=0+2.5×10
v=25m/s

Answer 2

v = u + at
0 = u + (-2.5m/s²)×10s
u = 25 m/s

Initial velocity of bike is 25m/s