1.

A 15 kg block is initially moving along a smooth horizontal surface with a speed of \[v=4\,m/s\] to the left. It is acted by a force \[F\], which varies in the manner shown. Determine the velocity of the block at \[t=15\] seconds.   Given that, \[F=40\cos \left( \frac{\pi }{10} \right)t\]

A. 12.5 m/s
B. 8.5 m/s
C. 20 m/s 
D. 9.5 m/s
Answer» B. 8.5 m/s


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