What is the mass of a truck if it is accelerating at a rate of 6.1 m/s? and it hits a parked car with a force of 15300 newtons?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

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).