a)
F = m ( v - u) / t = 1 ( 10 - ( - 10)) / 0.01
F = 2000 N
directed to the right
b)
let us assune the length of bat L = 1 m
using conservation of angular momentum
I w1 + m u r = mvr + I w2
(1/3) ML^2 w1 = m L ( v - u) + (1/3) ML^2 w2
30 = 1* 1* ( 10 + 10) + w2
w2 = 10 rad/s
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