Question

53. On a smooth horizontal surface a block
A of mass 10 kg is kept. On this block a
second block B of mass 5 kg is kept. The
coefficient of friction between the two
blocks is 0.4. A horizontal force of 30 N is
applied on the lower block as shown. The
force of friction between the blocks is
1) 30 N
u=0.4
2) 20 N
VB
30N
3) 10 N 4)ON -
Frictionless​

Answer 1

Answer:

20N

Explanation:

Friction=U×R

where U=coefficient of friction

R=Normal reaction

since on 5kg block force of 5g will act downword. which will be equal to R (normal reaction)

friction force is =0.4×50 (g=10m/s^2)

ans=20N