1. 1. The problem statement, all variables and given/known data Suppose a 66-kg boy and a 42-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl. 2. Relevant equations Newton's Second Law of Motion? 3. The attempt at a solution I tried to use Newton's Second Law but got a incorrect answer 2. A 4570-kg helicopter accelerates upward at 1.8 m/s2. What lift force is exerted by the air on the propellers? I did 4570/1.8 =2538.8888 N but that seems too big 3. An 880-kg (1945 lb) dragster, starting from rest, attains a speed of 26.0 m/s (58.2 mph) in 0.59 s. (a) Find the average acceleration of the dragster during this time interval. m/s^2 (b) What is the magnitude of the average net force on the dragster during this time? N (c) Assume that the driver has a mass of 68 kg. What horizontal force does the seat exert on the driver? 880-68 = 812?