A300.0-kg speedboat is moving across a lake at 35.0 m/s. what is the momentum of the speedboat?

a) 10,500 kg m/s2
b) 10,500 kg m/s
c) 5,250 kg m/s2
d) 91,875 kg m/s

Identify the forces that contribute to the centripetal force on the object in each of the following examples: a. a bicyclist moving around a flat, circular track b. a bicycle moving around a flat, circular track c. a racecar turning a corner on a steeply banked curve

With i really need the correct answer!

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