No work is done by a force on an object if(a) the force is always perpendicular to its velocity.(b) the force is always perpendicular to its acceleration(c ) the object is stationary but the point of application of the force moves on the object (d) the object moves in such a way that the point of application of the force remains fixed.

No work is done by a force on an object if(a) the force is always perp

1.	No work is done by a force on an object if(a) the force is always perpendicular to its velocity.(b) the force is always perpendicular to its acceleration(c ) the object is stationary but the point of application of the force moves on the object (d) the object moves in such a way that the point of application of the force remains fixed.
Answer» B, C & d are CORRECT a, b & d are correct a, c & d are correct all are correct ANSWER :C