13. A 80 kg baseball player begins his slide into third base at speed of 5 m/s. The coefficient of friction between his clothes and ground is 0.8 to make him stopped when he reached the third base. How far does he slide?
(A) 1.22 m
(B) 1.32 m
(C) 1.41 m
(D) 1.50 m
(E) 1.59 m

答案:登入後查看
統計: A(1), B(0), C(0), D(9), E(51) #2356589

詳解 (共 3 筆)

#4154604
 F = mguk = 0.8mg, a...
(共 132 字,隱藏中)
前往觀看
2
0
#4744417
棒球選手減速的加速度為0.8g=7.84
V2平方=V1平方+2aS
0=25-15.68S
S=1.59m
1
0
#4744422
另解
非保守力做功等於力學能變化 位能不變 只有動能改變 1/2x80x25=0.8x80x9.8xS
同樣可得S=1.59
1
0