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A 0.20-kg puck slides across a frictionless floor with a speed of 10 m/s. The puck strikes a softwall and stops. (a) The magnitude of the impulse on the puck is (A) 0 kg ∙ m/s (B) 1 kg ∙ m/s. (C) 2 kg ∙ m/s. (D) 4 kg ∙m/s. (b) The net work done on the puck is (A) – 20 J. (B) – 10 J. (C) 0 J. (D) 20 J.

A 0.20-kg puck slides across a frictionless floor with a speed of 10 m/s. The puck strikes a softwall and stops.
(a) The magnitude of the impulse on the puck is
(A) 0 kg ∙ m/s                   (B) 1 kg ∙ m/s.
(C) 2 kg ∙ m/s.                  (D) 4 kg ∙m/s.
(b) The net work done on the puck is
(A) – 20 J.                           (B) – 10 J.
(C) 0 J.                                (D) 20 J.

Grade:upto college level

1 Answers

Deepak Patra
askIITians Faculty 471 Points
8 years ago
233-818_1.JPG
From equation (4) we observed that, the magnitude of impulse on the puck will be 2 kg. m/s. Thus option (C) is correct.
b) The correct option is (B).
We have to find out the net work done on the puck.
The net work done is equal to the change in kinetic energy of the puck.
Kinetic energy of the body (K) is defined as the,
233-2235_1.JPG

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