5. A box of mass (m) is pushed over a horizontal surface a distance (x) from point A to B and then pushed back to from B to A along the same path. The total work done by the friction force will in this closed loop path : (k is co-efficient of friction) 65.dx (a) zero (b) 2mgx (c) HAmgz (d) - 2 Amgz (e) - HAmgr A X
5. A box of mass (m) is pushed over a horizontal surface a distance (x) from point A to B and then pushed back to from B to A along the same path. The total work done by the friction force will in this closed loop path : (k is co-efficient of friction) 65.dx (a) zero (b) 2mgx (c) HAmgz (d) - 2 Amgz (e) - HAmgr A X
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Transcribed Image Text:• 5. A box of mass (m) is pushed over a horizontal surface a distance (x) from point A to B
and then pushed back to from B to A along the same path. The total work done by the
friction force will in this closed loop path : ( is co-efficient of friction) 65 d
(a) zero (b) 21mgx (c) Hamgz (d) - 2 JAmgz (e) - HAmgr
a
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