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Q. A 5 kg block is on a horizontal surface, with which it has a coefficient of kinetic friction of 0.45 . This block is connected, by a massless, non-stretching string, over a massless, frictionless pulley, to a 3 kg block, hanging straight down. What is the acceleration of the two blocks, in meters per second squared?

Q. An artillery shell is fired with an initial velocity of 300 m/s at 48.5° above the horizontal. To clear an avalanche, it explodes on a mountainside 38.0 s after firing. What are the x and y components of the shell where it explodes, relative to its firing point?

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