Imagine a small child whose legs are half as long as her parent's legs. if her parent can walk at maximum speed v , at what maximum speed can the child walk?
a-v
b-v/2
c-2v
d-sqrt2* v
e-v/sqrt 2

The maximum speed can the child walk is v/sqrt 2

Explanation:

Let the length of parent’s leg be L

Then the length of the child’s leg

Maximum Speed at which the parent walks=V

To Find :

The maximum speed at which the child walks=?

Solution:

The Frequency of the simple pendulum

Speed of the parent  

Speed of the child

Now,

Result:

The maximum Speed at which the child can walk is

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.