# physics

posted by mothusi

Two blocks of 10kg and 4 kg ,respectively, are in contact with each other on frictionless,horizontal plane.They are moving at 20 metre per second.A 28N force is now applied horizontally to the opposite direction.Draw separate force diagrams for the two blocks, showing all the horizontal forces acting on a blocks,
calculate the acceleration of the blocks(-2metre per seconds squad,calculate the magnitude of the resultant horizontal force acting on the 10kg block (20N),calculate the force that the 4kg block exerts on the 10kg block and give an axplanation for the answer,for how mamy second must 28N retarding force be applied to achieve a 10metre per seconds speed in opposite direction(15seconds )

1. bobpursley

acceleration=force/mass=28/(10+4)=2m/s^2

force10kg=ma=10*2
force4kg=ma=(10*2)=20
the4 kg is pushing against the 10kg block

vf=vi+at
-10=20*28/14 * t
t=30/2=15sec

## Similar Questions

1. ### Physics

Three blocks on a frictionless horizontal surface are in contact with each other A force F is applied to block 1 (m1) Draw a free body diagram for each block ok for the diagram is the force F applied horizontal to mass one does this …
2. ### Physics

I got two questions Three blocks on a fricitonless horizontal surface are in contact with each other a force F is applied to block 1 mass m1 Draw a free body diagram for each block ok done the accelration of the system (in terms of …
3. ### Physics. Really stuck!

two blocks of masses m1 and m2 (m1>m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m1. if P is the magnitude of the contact force between the blocks, …

two blocks of masses m1 and m2 (m1>m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude F is applied to the block of mass m1. if P is the magnitude of the contact force between the blocks, …
5. ### Physics

Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.06 kg, M2 = 3.80 kg, and F = 4.85 N, find the size of the contact force between the two blocks. If instead an equal but oppositely …
6. ### Physics

Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.06 kg, M2 = 3.80 kg, and F = 4.85 N, find the size of the contact force between the two blocks. If instead an equal but oppositely …
7. ### Physics

Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.06 kg, M2 = 3.80 kg, and F = 4.85 N, find the size of the contact force between the two blocks. If instead an equal but oppositely …
8. ### Physics

Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.06 kg, M2 = 3.80 kg, and F = 4.85 N, find the size of the contact force between the two blocks. If instead an equal but oppositely …
9. ### Physics

Two blocks are in contact on a frictionless table. A horizontal force F is applied to M2, as shown. If M1 = 1.06 kg, M2 = 3.80 kg, and F = 4.85 N, find the size of the contact force between the two blocks. If instead an equal but oppositely …
10. ### Physics

Two blocks (M1 = 2.57 kg and M2 = 6.71 kg) are in contact on a frictionless, horizontal tabletop. An external force, $\vec{F}$, is applied to block 1, and the two blocks are moving with a constant acceleration of 2.59 m/s2. What is …

More Similar Questions