The shown slider–crank rotates at 60 rpm. Crank radius is 30 mm and connecting-rod length 120 mm. Find average piston speed over one crank revolution in mm/s, rounded to nearest integer.
The in-line slider stroke is twice crank radius, 60 mm. One revolution covers a forward and return stroke: 120 mm. At 60 rpm, one revolution takes one second. Average speed = **120 mm/s**; average velocity over the cycle is zero.
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