13. 54-kg box is sitting on the floor of a level railroad car which is moving forward with a speed of 25 m/s and accelerating at a rate of 5.6 m/s2. What is the strength, in Newtons, of the frictional force acting on the box if it does not slide on the floor? O A. 0 O B. 25 N O C. 54 N O D. 248 N E. 255 N O F. 302 N O G. 520 N O H. 1350N

A 80 kg person stands on a weight scale in a elevator. The elevator is moving up with a acceleration of 6 meter per second square. The normal force on the person is: a. 1264 N b. 784 N c. 1184 N d. 80 kg e. 480 N

2. If the net force acted upon an object is equal to zero, then its acceleration is equal to ________. a. mass x acceleration b. 9.8 m/s^2 z c. ero m/s^2 d. 100 m/s^2   3. The book is at the top of the wooden table, what are the forces exerted on the bool a. Friction and weight b. Normal force and weight c. Normal force and tension d. No force(s) exerted on the book   4. Which of the following state of motion will the body have zero acceleration?  a. free fall b. accelerated motion c. both at rest and in uniform motion d. uniformly accelerated motion   no need solution. answers only.

Given a block which is at rest on a perfectly flat smooth table. You push with your hand horizontally on the block with some force. If the mass of the block = 2.00 kg and the acceleration of the block = 5.00 m/s2 then what is the force on the block from your hand in SI units? A. 10.0 N   B. 0.100 N   C. 0.400 N   D. 2.50 N   E. zero