Let's clear up a few things. The coin in the lift is not accelerating, since the lift is traveling at constant speed. At the point of release, coin A will have some non-zero upward velocity and so will continue to move vertically upwards for some time. Coin B in contrast, is initially stationary and therefore will fall straight down. Upon release, both coins will experience the same acceleration (-g) and therefore will accelerate at the same rate. Therefore, coin B will hit the ground first. Try it yourself, throw a ball upwards and at the same time drop another ball - which hits the ground first?AllenHe said:My teacher told me that when the passenger on the lift drops the coin, the coin is still experiencing an upward acceleration.So its velocity will be slower than the person who drops the coinB on the second floor landing.
But I checked the answer at the back of the book, it says that Coin B will have a greater speed on impact,but it also said that Coin A will reach the bottom first.That's a bit confusing.
Then the book is incorrect. It is precisely the opposite: Coin A has the greatest speed on impact and Coin B will reach the bottom first.AllenHe said:Im getting it.But in the book, it said that CoinA will reach the bottom first, and coin B has the greatest speed on impact.
Motion refers to the change in position of an object over time.
The three types of motion are linear motion (movement in a straight line), rotational motion (movement around an axis), and oscillatory motion (back and forth movement).
The factors that affect an object's motion include its mass, speed, direction, and any external forces acting upon it (such as gravity or friction).
Motion is typically measured using units of distance (such as meters or feet) and time (such as seconds or minutes). The most common way to measure motion is by calculating an object's speed, which is the distance it travels divided by the time it takes.
The laws of motion were established by Sir Isaac Newton and describe how objects move. They include the law of inertia (an object will remain at rest or in uniform motion unless acted upon by a force), the law of acceleration (the force acting on an object is directly proportional to its mass and acceleration), and the law of action and reaction (for every action, there is an equal and opposite reaction).