contestada

A baseball has a mass of 0.145 kg and approaches a bat at 40.0 m/s. After it is hit, the ball leaves the bat at 50.0 m/s directly back. Find the impulse of the bat on the ball.

7.25 kg*m/s
13.1 kg*m/s
5.80 kg*m/s
1.45 kg*m/s

Respuesta :

Impulse is defined as change in momentum of object

so here we can say

Impulse = final momentum - initial momentum

[tex]I = P_f - P_i[/tex]

[tex]I = m(v_f - v_i)[/tex]

here we know that

m = 0.145 kg

[tex]v_f = 50 m/s[/tex]

[tex]v_i = - 40 m/s[/tex]

now we will have

[tex]Impulse = 0.145 kg(50 m/s + 40 m/s)[/tex]

[tex]Impulse = 13.05 kg m/s[/tex]

so impulse of the bat on ball is approx 13.1 kg m/s

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