a 50 kg boy on ice skates throws a 5 kg ball to the left. if the ball ends up going 20 m/s, how fast is the boy going?

Photons with the highest energy have the longest period

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.

Energy transformations that involve one transformation from one type of energy to another are called transformations.