Impulse is the product of the average force and the time the force is exerted.
The forces between the colliding objects cannot be neglected because the impulse involves force hence option a. is incorrect.
In the impulse approximation, __________.
a. the forces between colliding objects can be neglected
b. no external forces act on the system
c. the true impulse is approximated by a rectangular pulse
d. external forces can be neglected during the time the impulsive force acts
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