Physics
posted by Henry .
A 60 kg block slides along the top of a 100 kg block with an acceleration of 3.0 m/s2 when a horizontal force F of 320 N is applied. The 100 kg block sits on a horizontal frictionless surface, but there is friction between the two blocks.
(a) Find the coefficient of kinetic friction between the blocks.
(b) Find the acceleration of the 100 kg block during the time that the 60 kg block remains in contact.

u=friction coeficient
F(net)=m*a
F(net)=FF(friction)
F(friction) = u*N
N= m*g
F(net)=> F  (u*m*g)=m*a
(u*m*g) = m*a  F
> u =  (m*a  F)/(m*g)
u = (60kg*3.0m/s2  320N)/(60kg*9.81m/s2)
sorry, not sure how to do part B
Respond to this Question
Similar Questions

Physics
A 60 kg block slides along the top of a 100 kg block with an acceleration of 4.0 m/s2 when a horizontal force F of 325 N is applied. The 100 kg block sits on a horizontal frictionless surface, but there is friction between the two … 
physics
The horizontal surface on which the block of mass 4 kg slides is frictionless. The force of 30N acts on the block in a horizontal direction and the force of 60N acts on the block at an angle. What is the magnitude of the resulting … 
physics
A force of 8.7 N is applied to a steel block initally at rest on a horizontal frictionless surface. The force, which is directed at an angle of 30.0o below the horizontal, gives the block a horizontal acceleration of 5.3 m/s2. a) Draw … 
Physics.
A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. The surfaces of the blocks are rough. A constant force of magnitude F is applied to the first block. … 
Physics
A block of mass 3m is placed on a frictionless horizontal surface, and a second block of mass m is placed on top of the first block. The surfaces of the blocks are rough. A constant force of magnitude F is applied to the first block … 
urgent physics ?
I have drawn my force body diagrams, but I need help making forming the equation for this problem. Any assistance is greatly appreciated! A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of … 
Physics
The horizontal surface on which the block of mass 5 kg slides is frictionless. The force of 29 N acts on the block in a horizontal direction and the force of 58 N acts on the block at an angle(top Right). What is the magnitude of the … 
Physics
Speed: A block lies on a horizontal frictionless surface. A horizontal force of 100 N is applied to the block, giving rise to an acceleration of 3 m/s2. What is the speed of the block after 10s? 
Physics
A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of 3.7 m/s2 when a horizontal force F= 350 N is applied. Assuming there is no friction between the bottom 100 kg block and the horizontal … 
Physics! Need help!
A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of 3.4 m/s2 when a horizontal force F= 370 N is applied. Assuming there is no friction between the bottom 100 kg block and the horizontal frictionless …