Ricky, mass 95 kg, and cathy, who is lighter, are enjoying lake mendota at dusk in a 20 kg canoe that is 3.0 m long. when the canoe is at rest in placid water, they exchange seats, which are at the ends of the canoe. ricky notices the canoe moved 30 cm relative to a submerged rock during the exchange and uses that to calculate cathy’s mass. what is cathy’s mass?

it would be kevlar ^^

the area between the graph and the t axis

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me