Theory of Machine
When the crank is at the outer dead centre, in a reciprocating steam engine, then the acceleration of the piston will be

ω² r {n/(n - 1)}
ω² r {(n + 1)/n}
ω² r {n/(n + 1)}
ω² r {(n - 1)/n}

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Theory of Machine
In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

In order to have acceleration in beginning and retardation at the end of stroke within the finite limits
Because of loose contact of follower with cam surface
Because of difficulty in manufacturing cam profile
Because the uniform velocity motion is a partial parabolic motion

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