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The kinetic energy of an object with a mass of #1 kg# constantly changes from #126 J# to #702 J# over #9 s#. What is the impulse on the object at #5 s#?

Answer 1

Benjamin Asiedu

Cannot be answered

#K.E. = k*t#

#=> v = sqrt((2k)/m) sqrt(t)#

#=> int_i^f m dv = int_t^(t+5) sqrt(k/2m) dt/sqrt(t)#

Therefore, we must be clear about which 5s we are referring to in order to get the impulse's absolute value.

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Answer 2

Amelia Adams

The impulse on the object at 5 s is 70 N·s.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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