Question

A球自塔顶自由落下,当落下am时,B球自距塔顶bm处开始自由下落,两球恰好同时落地,则塔高为?

Answer 1

a = 1/2gt1^2

H = 1/2g(t + t1)^2

H – b= 1/2gt^2

解得H=(a+b)^2/(4a)

选C