Question

Jane pushes a box loaded with penguins, which is initially at rest, across the floor with a constant force of 500 N. A frictional force of 150 N acts on the box. The total mass of the box and penguins is 100kg. What is the acceleration of the box? 1.5 m/s2 5 m/s2 3.5 m/s^2 0.3 m/s2 0.2 m/s2 Jane pushes a box loaded with penguins, which is initially at rest, across the floor with a constant force of 500 N. A frictional force of 150 N acts on the box. The total mass of the box and penguins is 100kg. If Jane pushes the box for 5 meters, how much work does she do on the box?

Answer 1

=150N a F-500n Partit Net free acting on the system = 3 F- Fu n Fret = (500-150) = 350r em=100kg By Necuton's law, Fnet a mass x acceleration = ma =350 . acceleration, a = 305 m/s Part-B Work done by her, ' We Funta d=.5m. . z 500x5 J = 2500 J..