Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

Tend to compress each other till they are compressed maximum possible
Attempt to regain its original shape due to their elasticities
All listed here
Immediately after collision come momentarily to rest

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Applied Mechanics and Graphic Statics
‘ω’ rad/sec is the angular velocity of a crank whose radius is ‘r’. If it makes θ° with inner dead centre and obliquity of the connecting rod ‘l’ is ‘ϕ’, the velocity v of the piston, is given by the equation

ω² (l cos ϕ + r sin ϕ tan θ)
ω² (l sin ϕ - r cos θ tan ϕ)
ω² (l sin ϕ + r cos φ tan θ)
ω (l sin ϕ + r cos ϕ tan θ)

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