Question

A 2.3 kg steel block is at rest on a steel table. A horizontal string pulls on the block. The coefficient of static friction for steel on steel is 0.80 (page 163) while the coefficient of kinetic friction is 0.60 while the acceleration due to gravity is 9.80 m/s2. If the tension in the string is 20.0 N, what is the block's speed (in m/s) after moving 1.7 m?

Answer 1

tension-friction= mass*acceleration
20.0-.6*2.3*9.8= 2.3*a
solve for acceleration, a.

vf^2=2ad solve for Vf