. Mass 1 has a momentum of 20 kg*m/s. Mass 2 has a momentum of 50 kg*m/s. They have a perfectly elastic collision. After the collision, the momentum of Mass
1 is 15 kg*m/s. What is the momentum of Mass 2?

Help please

Asher cycles 12 miles in 16 hours. what is his speed?

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).