A student proposes the following description for the impulse on a 2 kg object th
ID: 1449366 • Letter: A
Question
A student proposes the following description for the impulse on a 2 kg object that changes direction and speed as shown below: The impulse given to a 2 kg object that goes from moving at 3 m/s in the +x-direction to 7 m/s in the +y-direction in 5 seconds is (2 kg) (+7 m/s y) = 14 kg m/s y since the impulse equals the change in momentum. The 5 seconds does not enter into the calculation of this impulse. What, if anything, is wrong with this statement? If something is wrong, identify and explain how to correct all errors. If this statement is correct, explain why.Explanation / Answer
Yes it is wrong,They consider momentum as scalar, but it is not correct.
in finding impulse time is not entered into the calculation
m =2 kg , u = 3i , v = 7 j
impulse = change in momentum
impluse = m(v-u) = 2(7j-3i)
impulse = (14j - 6i) kg.m/s
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