u= 9.4m/s v= -7.4m/s (Negative sign because it is in the opposite direction as he is rolling back) t= ? s= ? a= ? Now, a= v-u/t = -7.4-9.4÷3 =-5.6 By the second equation of motion. s= ut+1÷2at*2 ( *2 is the power) s= 9.4×3+1÷2×-5.6×3*2 = 28.2 +(-25.2) =3 Therefore s or the distance travelled is 3m.
