Question

a truck of mass 7metric tonnes is moving with speed 36km/h when brake is applied it stops in 1.2seconds what is retardation of truck​

Answer 1

1. mass(m)=7×10^5,t=1.2s,u=36kmph=36×5/18=10m/s,v=0m/s
2. a=v-u/t=0-36/1.2=》-36×12/10=》-43.2
3. a(retardation)=-(-43.2)=43.2m/s^2