A 61.0 kg sprinter starts a race with an acceleration of 2.20 m/s2. What is the net external force (in N) on him? (Enter the magnitude.) N

A horizontal force of 195 N is required to push a crate across a floor at a constant speed. What is the net force acting on the crate? N What is the force of friction acting on the crate? N

Ⓒ Macmillan Learning Two skydivers are holding on to each other while falling straight down at a common terminal speed of 54.70 m/s. Suddenly, they push away from each other. Immediately after separation, the first skydiver, who has a mass m₁ of 94.80 kg, has a velocity U₁ with the following components ("straight down" corresponds to the positive z-axis). V1.x = 4.930 m/s V1.y = 3.750 m/s V1,z = 54.70 m/s What are the x- and y-components of the velocity U₂ of the second skydiver, whose mass m₂ is 52.20 kg, immediately after separation? Assume that there are no horizontal forces of air resistance acting on the skydivers. U2,x = m/s What is the change in kinetic energy of the system AK system? AK system = joules U2,y = m/s

Item 19 If a car stops suddenly, you feel "thrown forward." We'd like to understand what happens to the passengers as a car stops. Imagine yourself sitting on a very slippery bench inside a car. This bench has no friction, no seat back, and there's nothing for you to hold on to. Part C Identify Check all that apply. Il of the forces acting on you as the car slowing down. 0 Normal force, n ✔Weight, w Tension force, T Friction force, f Submit My Answers Give Up Incorrect; Try Again; 2 attempts remaining