V² - ½ ( V is to the squal to be in the resent acting one-half the particle is equare of the work done-half then stant acceleration a. We call on displacement acceleration, the acceleration of its speed a. Let us choose this way: The partic energy of then K = m V² - ½ m a x = 0 and at time this the constant force of the symbol K, the square v ) t. The t. Here of the represultant acting one is its speed the t.