The figure shows a spring attached to a 2.0 kg block. The other end of the spring is pulled by a motorized toy train that moves forward at 5.0 cm/s. The spring constant is 50 N/m, and the coefficient of kinetic friction between the block and the surface is 0.60. The spring is at its equilibrium length att = 0 sec when the train starts to move. When does the block slip? 5.0 cm/s_ 20ks wW- 3.2 sec 4.7 sec 5.3 sec 6.9 sec O Not enough information

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A box of mass 100.0kg rests on level ground and there is no friction between the box and theground. Resting on top of that mass is a 40.0kg mass with friction coecient that's unknown. A ropeis tied to the 100.0 kg mass and draped over a pulley from which a third mass hangs. How much massmust the hanging mass have in order for the acceleration of all masses to be 5ms2 ? What is the minimum possible friction coecient of the 40.0kg mass in the prior problem?

no, i want to solve for the coefficient of static friction