A girl with a mass of 52kg rides a skateboard with a mass 1.5kg. She uses her foot to apply a force on the ground. While pushing with her foot, she and the skateboard accelerate together at a rate of 2.4m/s². What force did she apply to cause this acceleration?

Mary applies a force of 80 N to push a box with an acceleration of 0.54 m/s2. When she increases the pushing force to 87 N, the box's acceleration changes to 0.84 m/s2. There is a constant friction force present between the floor and the box. (a) What is the mass of the box in kilograms? kg (b) What is the coefficient of kinetic friction between the floor and the box?

A small rocket of weight 1.7 lbs is launched vertically with thrust 3 lbs from a stand on the ground at time t = 0 seconds. It has a constant thrust for the first second, then no thrust after that. We will assume no air friction and ignore the mass change of the rocket for now. Determine how long it will take until the rocket reaches maximum height. seconds

A 1,910 kg African bush elephant (Loxodonta africana) is pushing a 2,890 kg car. The elephant and the car move forward together with a maximum forward force of 8,750 N. Assuming friction is zero, what is the magnitude of the force (in kN) of the rhinoceros on the car? Enter only the numerical part of your answer to three significant figures.

a. How far does she travel in 8 s? 3.) The driver of mass 80 kg is strapped to the seat of his Ferrari. If she comes to a stop after traveling at 30 m/s in 2 s, determine the force on the driver from the seatbelt.

While standing on a horizontal frictionless surface, two students push against each other. One student has a mass of 55 kg and the other has a mass of 45 kg. If the acceleration of the 55 kg student is 0.85 m/s2 south, what is the acceleration of the 45 kg student?

During your winter break, you enter a sled race. You push the sled with a force of 210 N at 30.0° below the horizontal as shown. The mass of the sled (and your nephew sitting on it) is 35.0 kg. The coefficients of friction between the sled and icy surface are us = 0.35 and uk = 0.20. What is the magnitude of the acceleration of the sled, in m/s2? Use g = 10.0 m/s?. Your answer needs to have 2 significant figures, including the negative sign in your answer if needed. Do not include the positive sign if the answer is positive. No unit is needed in your answer, it is already given in the question statement.

Laila, who is a part of a critical patient's medical team was responsible for pushing a cart including a transport organ box containing a viable heart and other medical supplies needed for a heart transplant. In a rush, she pushed the 60.0 kg cart (this includes the supplies in it) down the long OR hallway. With the cart accelerating at 4.00 m/s/s with a force of 550 N, how much friction is acting on the cart + equipment due to its mass?

The traveller travels to a planet in a neighboring solar system. It is a long trip, but she somehow manages to maintain her physical condition by conscientious exercise and diet control. The acceleration due to gravity on this planet is 12.3 m/s². What is the traveller's mass m' on the planet? m² = 730.25 kg

You are given two masses, m₁ and m2, strapped on a pulley with a rope. m₁-13 kg and m2-17 kg. What is the equation to be used to find the system's acceleration? O a (m₂g + m₁g)/(m₂ - m₁) = a= = (m2g - m1g)/(m₂ - m₁) a = (m₂g + mig)/(m2 + m₁) O a (m₂g-m₁g)/(m₂ + m₁) =