An object B is projected upwards from a height of 60m above the ground with a velocity of 20ms-1 at 30° to the horizontal. At the same time, an object Q is projected from the ground
upwards towards B at 30° to the horizontal. If B and Q collide, at a height of 60m above the
ground while they are both moving downwards,
1) Find the speed of projection of Q
2) The kinetic energy of B just before colliding with Q if it's mass is 1/2kg.
3) The horizontal distance between the points of projection.​

Automobile fuel efficiency is often measured in miles that the car can be driven per gallon of fuel (mpg). heavier cars tend to have lower fuel efficiencies (lower mpg ratings). which variable (weight or fuel efficiency) is most naturally considered the explanatory (predictor) variable in this context?

12. a body is a particular amount of matter. it can be a solid, liquid or gas. it can be described as existing in a. size and shape. b. motion and force c. time and space. d. location and movement.

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)