Question

John coasts on his skateboard at a speed of 4 m/s. He uses his foot to increase his speed to 5 m/s. If he has a mass of 103 kg, what impulse does he apply

Answer 1

103 kg m/s would be the answer
4-5=1*103= 103kg m/s

Answer 2

Answer:

Impulse = 103 kg m/s

Explanation:

As we know that impulse is defined as change in momentum

So here we will have

$Impulse = P_f - P_i$

here final speed is 5 m/s after he use his foot while his initial speed is given as 4 m/s

now we will have

$P_f = 103 \times 5$

initial momentum is given as

$P_i = 103 \times 4$

now impulse is given as

$Impulse = (103 \times 5) - (103 \times 4)$

$Impulse = 103 kg m/s$