Two boxes, one of mass 60 kg and the other 90 kg, are in contact and at rest on a surface where the coefficient of static friction between the boxes and the surface is 0.5. An 800-N pushing force is exerted on the 60 kg box toward the 90 kg box. a) Calculate the acceleration of the boxes (G.R.A.S.S). b) Calculate the magnitude of the action and reaction forces between the boxes. (G.R.A.S.S.)

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While in space far from any gravitational body, a 120-kg astronaut pushes off a 2400 kg space vehicle. The contact lasts .25 seconds, after which the astronaut is traveling 1 m/s a) what's the magnitude of the pushing force?  b) what's the speed of the vehicle after the contact has ended? c) how is Newton's 3rd law demonstrated?

A man is pulling up on a rope which is redirected around a massless frictionless pulley. The box is partially resting on the floor. The elevator is traveling upwards but slowly  a) imagine a scale is placed under the box. Which of these forces on the box represents what the scale reads? b) solve for the scale reading w the following values: m=10kg, a=2m/s^2, force of box on rope = 5N, force of box on man = 600N c) what is the 3rd law reaction pair to Force of box on earth in 2 subscript notation?

A steady 45 N horizontal force is applied to a 15 kg object on a table.  The object slides against a friction force of 30 N.  Calculate the acceleration of the object in m/s. Notes: Use 9.8 m/s 2 for the acceleration due to gravity.  For Newton's Law calculations, mass must be expressed in kg and velocity must be expressed in m/s.