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jasenka [17]
3 years ago
11

A boat of mass 225 kg drifts along a river at a speed of 21 m/s to the west. what impulse is required to decrease the speed of t

he boat to 15 m/s to the west?
Physics
2 answers:
zzz [600]3 years ago
8 0
The impulse required to decrease the speed of the boat is equal to the variation of momentum of the boat:
J=\Delta p=m \Delta v
where
m=225 kg is the mass of the boat
\Delta v=v_f-v_i=15 m/s-21 m/s=-6 m/s is the variation of velocity of the boat
By substituting the numbers into the first equation, we find the impulse:
J=m\Delta v=(225 kg)(-6 m/s)=-1350 N s
and the negative sign means the direction of the impulse is against the direction of motion of the boat.
kondaur [170]3 years ago
4 0

Answer:

as the other person explained, the answer is 1350 kg*m/s east

Explanation:

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