S2 and M2

2. A block P moving on a horizontal surface with speed 4m/s hits a stationary block Q. After the colllision both blocks move in the same direction with speeds 3m/s and 1m/s. State which block has speed 3m/s and calculate the coefficient of restitution.

I said that Q was travelling at 3m/s as it was infront.... for the rest of it do you have to do something with the impulses??

orangeness

Could someone adivse me on how to solve these problems:

1. In a county, there are on average 1.8 potholes per 100m of roadway. Calulate the probablity that there are fewre than 3 potholes in each of the 5 randomly chosen 200m streches of the countries roadways. (ans 0.00254)

I was thinking that it was a poisson distribution, and I thought that you would have to do 1.8*2 due to the differnce in road length....... but using a variety of methods i couldnt get the ans in the back of the book.

2. A block P moving on a horizontal surface with speed 4m/s hits a stationary block Q. After the colllision both blocks move in the same direction with speeds 3m/s and 1m/s. State which block has speed 3m/s and calculate the coefficient of restitution.

I said that Q was travelling at 3m/s as it was infront.... for the rest of it do you have to do something with the impulses??

orangeness