8. A block of mass 9 kg is initially at rest on a smooth horizontal surface...

Transcribed Image Text:

8. A block of mass 9 kg is initially at rest on a smooth horizontal surface and a hori- zontal force of 3 N is applied to it for 5 seconds. Find the speed of the block after this time. 9. A brick of mass 2 kg falls through water. The upward force (in Newtons) that resists the motion of the brick is 10+ 0.2v2, where v is the downwards speed of the brick. Draw a diagram showing all the forces acting on the brick. Calculate the acceleration of the brick just after it is first dropped. Calculate the terminal speed of the brick. 8. A block of mass 9 kg is initially at rest on a smooth horizontal surface and a hori- zontal force of 3 N is applied to it for 5 seconds. Find the speed of the block after this time. 9. A brick of mass 2 kg falls through water. The upward force (in Newtons) that resists the motion of the brick is 10+ 0.2v2, where v is the downwards speed of the brick. Draw a diagram showing all the forces acting on the brick. Calculate the acceleration of the brick just after it is first dropped. Calculate the terminal speed of the brick.