Could somebody help ? A boy with mass 5okg running at 5m/s jumps on to a 20kg trolley traveling in the same direction at 1.5m/s. What is their common velocity ?!

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.

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it

answeralert drivers who drift off the road;