只要第二问,高一上物理,牛顿运动定律,题挺简单就是我和答案怎么都不一样,结果得5.2m,谢谢了。
1个回答
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(1)
F - f = ma
a = (F - f)/m
= 72/60
= 1.2 米/秒^2
v1 = at1 = 1.2米/秒
s1 = v1/2 = 0.6米
(2)
f = - ma2
a2 = - 12/60
= - 0.2米/秒^2
v2 = v1 + a2t2
= 1.2 - 0.4
= 0.8 米/秒
v3^2 - v2^2 = 2a1s1
v3^2
= v2^2 + 2a1s1
= 0.64 + 1.44
= 2.08 (米/秒)^2
s3 = v3^2 / (2a2)
= 5.2 米
F - f = ma
a = (F - f)/m
= 72/60
= 1.2 米/秒^2
v1 = at1 = 1.2米/秒
s1 = v1/2 = 0.6米
(2)
f = - ma2
a2 = - 12/60
= - 0.2米/秒^2
v2 = v1 + a2t2
= 1.2 - 0.4
= 0.8 米/秒
v3^2 - v2^2 = 2a1s1
v3^2
= v2^2 + 2a1s1
= 0.64 + 1.44
= 2.08 (米/秒)^2
s3 = v3^2 / (2a2)
= 5.2 米
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