7. Two campers dock a canoe. One camper steps onto the dock. This camper has a mass of 80 kg and moves forward at 4.0 m/s. With what speed and direction do the canoe and the other camper move if their combined mass is 110 kg?

1.68 m/s

Explanation:

Given that,

Mass of a camper, m₁ = 80 kg

Initial speed of the camper, v₁ = 4 m/s

We need to find the speed and the direction of the canoe and the camper if their combined mass is 110 kg, Let it is V. The momentum of the system remains conserved. Using the law of conservation as follows :

So, the combined speed of canoe and the camper is 1.68 m/s.

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.