Physics2A Lectur × F17 Physics2A Lectu × F 17 Physics2A Lectur × 67 welcome, Cat
ID: 1796641 • Letter: P
Question
Physics2A Lectur × F17 Physics2A Lectu × F 17 Physics2A Lectur × 67 welcome, Cathe arn.ucr.edu/bbcswebdav/pid-3011283-dt-content- a Search 133% - + Automatic Zoom Activity 2B-2 1. A ball with mass m is thrown straight up into the air. At each of the following instants determine whether the ball's acceleration is greater than g, equal to g, less than g, or zero? Ignore air resistance in this situation. a. Just after leaving your hand: acceleration: Explain: b. At the very top (maximum height): Explain: acceleration: Just before hitting the ground: Explain: c. acceleration: d. Two students are discussing their results from the parts above: Student 1: 1 think that acceleration is different in part b, because at the top of its motion the velocity Student 2: I don't think so. If gravity is the only thing affecting the object's acceleration must be the is zero and hence the acceleration must be zero. same for each case. Which of these students, if any, do you agree with? Briefly explain your reasoning.Explanation / Answer
After leaving hand projectile is in air, when the object in air it can experience gravitational force only so
At any point in air it can have acceleration ,acceleration due to gravity(g).
Acceleration is acceleration due to gravity at any point even at maximum height where even it's velocity is zero.
In air force acting on an object F =mg.
But according to newtons 2nd law net force F =ma.
Therefore ma=mg,
a = g.