Một hòn bi lăn dọc theo một cạnh của một mặt bàn hình chữ nhật nằm ngang cao h = 1,25 m. Khi ra khỏi mép bàn, nó rơi xuống nền nhà tại điểm cách mép bàn, nó rơi xuống nền nhà tại điểm cách mép bàn L = 1,50 m (theo phương ngang) ? Lấy g = 10m/s2 Thời gian hòn bi rơi là: A. 0,35 s B. 0,125 s C. 0,5 s D. 0,25 s

Các câu hỏi liên quan

Bài 1: Chia động từ trong ngoặc ở thì quá khứ đơn hoặc quá khứ tiếp diễn • My friend Harry _______________ off the ladder while he _______________ the ceiling of his room. (FALL, PAINT) • We _______________ the house in 2003. At that time it _______________ £ 150,000. (BUY, COST) • Dad _______________ interested in buying a new car. (NOT BE) • My sister __________________ for me at the airport terminal when I _______________. (WAIT, ARRIVE) • A few nights ago, I _______________ a book when suddenly I _______________ a noise outside. A few teenagers __________________ loud music. (READ, HEAR, PLAY) • The fire ____________________ when the first firefighters _______________ at the scene. (STILL BURN, ARRIVE) • My brother _______________ for a job when he _______________ across an interesting ad in the newspaper. (LOOK, COME) • I _______________ someone call my name. I _______________ around and _______________ my dad standing at the back of the queue. I _______________ so surprised. (HEAR, TURN, SAW, BE) • My sister _______________ a bright summer dress when I _______________ her at the performance. (WEAR, SEE) • I _______________ preparing dinner at 4.pm and I _______________ still at it when my wife _______________ home. (START, BE, COME) • Our housekeeper _______________ the vase. As she _______________ up the pieces, she _______________ her middle finger. (BREAK, PICK, CUT) • We suddenly _______________ that we _______________ in the wrong direction. (REALISE, DRIVE) • She _______________ a great skier when she was young. (BE) • I _______________ an old friend in town while I _______________ the shopping. (MEET, DO) • While the children _______________ with others my husband and I _______________ to have a cup of coffee. (PLAY, DECIDE)