You drop a 14-g ball from a height of 1.5 m and it only bounces back to a height of 0.85 m. what was the total impulse on the ball when it hit the floor? (ignore air resistance.)

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Physics

Rebecca Gould

17 July, 11:01

You drop a 14-g ball from a height of 1.5 m and it only bounces back to a height of 0.85 m. what was the total impulse on the ball when it hit the floor? (ignore air resistance.)

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Sophia Goodwin · Answer 1

Remember that impulse = change in momentum

this means we compute the momentum of the ball just before impression and just after; we know the mass, so we find the speeds

the ball falls for 1.5m and will achieve a speed given by energy conservation:

1/2 mv^2 = mgh = > v=sqrt[2gh]=5.42m/s

since it rises only to 0.85 m, we compute the initial speed after power from the same equation and get

v (after) = sqrt[2*9.81m/s/s*0.85m] = 4.0837 m ...

now, recall that momentum is a vector, so that the momentum down has one sign and the momentum up has a positive sign, so we have

impulse = delta (mv) = m delta v = 0.014 kx (4.08m/s - (-5.42m/s) = 0.133 kgm/s