Ball 1, with a mass of 20kg is moving to the right at 20 m/s. at what velocity should ball 2, with a mass of 40kg, move so that they both come to a standstill upon collision?

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.