Question

Two Blocks on Ice Two stacked boxes are sliding along an ice rink with an initial velocity of vo to the right. You are trying to stop the boxes so you exert a force F on the top box as indicated in the figure. yl Yo The magnitude of the force that you exert is variable, and follows the equation: y1 with Fo and b constants, and t the time since you began exerting the force. Because the boxes are sliding on ice, the friction between box 2 and the ground is negligible. There is friction between the two boxes, and they are observed to accelerate together as you exert the force to slow them down

m1=70 kg
m2=26 kg
=320  
F0=115 N
b=017 s?1  
t1=2077 s
v0=119 ms

Find Accelerattion at t1

Speed at ti

Find the magnitude of the friction force from 1 on 2 at t1. You may use

s=020  
k=016

Total time it takes to stop the two blocks

Answer 1

COS 2 = 137.105 oI6x137 105 21,936 N ott o.l7 -0 3186 1665 t = 0,9711 s.