Physics help...?

Question

(label answers)

when the mass of a moving object is doubled with no change in speed, by what factor is its momentum changed?its kinetic energy?

when the velocity of an object is doubled by what factor is itsmomentum changed?its kinetic energy?

Consider a ball thrown straight up in the air. At what position is its kinetic energy a maximum? Where is its gravitational potential energy a maximum?

Answer 1

1. its momentum is changed by a factor of 2 and so is its KE

2. momentum is changed by a factor of 2 and KE by a factor of 4

3. KE max= at the start and at the end

PE max=at the top

Answer 2

1.  Doubling the mass doubles its momentum and kinetic energy.

2.  Doubling the velocity doubles its momentum and quadruples its kinetic energy.

3.  Maximum kinetic energy is when it hits the ground on its way down, as that should be slightly faster than the speed with which you threw it up (unless you are VERY short!)  Gravitational potential energy is at a maximum when it is at the top of its path, momentarily stopped.