Phương trình chuyển động của một chất điểm dọc theo trục Ox có dạng:x = 5 + 60t , x tính bằng mét (m), t đo bằng giờ (h).Chất điểm đó xuất phát từ điểm nào, chuyển động với vận tốc bằng bao nhiêu?

When you drop a pebble from height a it reaches the ground with speed v if there is no air resistance. from what height should you drop it so it will reach the ground with three times the speed? (a) 9m (b) 3m (c) 6m (d) 18m

A3.9 g aluminum foil ball with a charge of +4.1×10−9 c is suspended on a string in a uniform horizontal e⃗ field. the string deviates to the right and makes an angle of 30∘ with the vertical. part a part complete what information about the e⃗ field can you determine for this situation? what information about the field can you determine for this situation? only the magnitude of e⃗ only the direction of e⃗ both the magnitude and the direction of e⃗ none of the above previous answers correct part b determine the magnitude of the electric field. express your answer with the appropriate units. e e = nothing nothing request answer part c determine the direction of the electric field. determine the direction of the electric field. to the right to the left away from you toward you

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving