1>A system consists of three particles, each of mass 5.00 g, located at the corners of an equilateral triangle with sides of 30.0 cm.
(a) Calculate the potential energy of the system.
(b) If the particles are released simultaneously, where will they collide?
2>At the Earth’s surface a projectile is launched straight up at a speed of 10.0 km/s. To what height will it rise? Ignore air resistance and the rotation of the Earth