Question

less.) The coefficient of kinetic friction between block A and the inclined plane is Mk = 0.2. Initially the blocks are moving but eventually come to stop. You will be asked to solve for different things. Please pay attention: the numbers may change from problem to problem since they are randomized. 4) If block A weighs 90 lb and block B weighs 70 lb, and initially block A moves down the plane at a velocity of 7.2 ft/s, determine how far block A will move along the surface until it stops. Your answer must include 2 places after the decimal point and the proper unit. Take g = 32.2 ft/s2. A C D ВІ

Answer 1

Let block A go down by distance S shown. o С S 63 Pulley will go up by distance also will کج کا / and pulley D. Block wille go up by 2x₂ = 5 ft Now, FBD OF A Frictional force on o A=f allen = 0.2x90xų 5 qox * 90x van 90 = 14.4 lb. ft Now, A A А using consavation of energy (change in KE) + (work by gravity) (work against friction) (Wook against gravity) (420X @s) - (14.485) 90 > x 702 + 32.2 70x S. 70 % => 72.us + sug - 14.48 30.4 8= 72.us sa 72.45 2.38 ft. 30.4