speed of a flying body in air is 100kmphalong the circumference the change in velocity in half rotation is?

Answer 1

In half the rotation, the direction of velocity will become perpendicular to original direction and will be equal in magnitude to the original as no force acts in direction of motion(if the air-resistance is negligible).
suppose initial direction is along positive z-axis
=>/\ V=V2-V1
=>/\ V=100(-k^) -100(k^)=200(-k^)
/\V=delta V(change in velocity)
k^=unit vector along z-axis(axis perpendicular to the x-y plane)

Answer 2

Your question is difficult to understand.

Velocity is speed measured in a given direction. So if the speed or direction, or both change - then the velocity changes.

If the object is rotating in a circular motion at a fix speed, then for a half revolution the object will have change direction by 180º. The speed may still be the same, but it's direction is reversed.

Answer 3

Please re-phrase just copy the Q?

Circumference=pieD=22/7x D

you mean 100 Km per hour along the Circumference. What is the change in velocity in half rotation.

Since there is no acceleration the Change in velocity is Zero.

Answer 4

Calculate Kinetic energy and divide it in half
KE= 1/2* m^2

Answer 5

Answer to ur question

v(final)-V(initial)= -100-100=-200km/hr