1.A 50 cm by 20 cm block weighing 150 N is to be moved at aconstant velocity of .8m/s on an inclined surface of 20 degreesfrom horizontal with a friction coefficient of .25.
a. Determine force F that needs to be applied in thehorizontal direction to move the block.
b. If a .3mm thick oil firm with a dynamic visocity of .015 Pas is applied between the block and inclined surface determine thehorizontal force F required to move the block
c. Determine the percent reduction in the required force whenthe oil film in b. is placed between the block and slope
2.Ball A is thrown vertically upward from the top of a30-m-high-building with initial velocity of 5m/s. At the same instant another ball B is thrown upward from the ground with aninitial velocity of 20m/s. Determine the height from the ground andthe time at which they pass.