The power needed to accelerate a projectile from rest to its launch speed v in a time t is 42.0 w. how much power is needed to accelerate the same projectile from rest to a launch speed of 2v in a time of t?

168 W

Explanation:

Given

Power needed

initial Launch velocity is v

Energy of projectile when it is launched

Power when it is launched with 2 v

Divide 1 & 2 we get

the components of a vector are the parts of the vectors that are to each other.

b perpendicular