The velocity of piston is nearly

Question

The crankshaft of reciprocating engine having a 20 cm crank and 100 cm connecting rod rotates at 210 r.p.m. When the crank angle is 45o, the velocity of piston is nearly                          

(a) ) 1.8m/ s                    (b)  1.9m/ s

(c) 18m/ s                        (d)  19m/ s