Posted by **Sandhya** on Wednesday, April 22, 2009 at 10:40pm.

Force F causes displacement d of a 20-Kg object starting from rest along a frictionless path. F= 10 N i + 50 N j + 15 N k and d= 10 m i + 60 m k

A) Calculate the work done by the force.

B) Calculate the angle between the vectors F and d.

C) Calculate the final speed of the object.

- Physics -
**drwls**, Thursday, April 23, 2009 at 1:44am
A) The work done is the scalar product of the F and d vectors.

B) The cosine of the angle between the two vectors is the ratio of the scalar product (obtained in part (A)) to the product of the magnitudes os the F and d vectors.

C) I do not understand why the displacement is not in the direction of the force, since it starts out motionless and there is no friction

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