⇒∫1+v−1(1−v)⇒∫dv(1−v)−∫(1−v)dv(1−v)⇒−log|1−v|−∫dv⇒log(1−v)−1−v+C⇒log1(1−v)−v+C
A boy runs along a straight path for the first half of the distance with a velocity v1 and the second half of the distance with a velocity v2. The average velocity V is given by