【题目 】 求一道简单的模拟SAT的数学题Thehei ght o f an object thrown upward from the roof o f a building 408ft tall. with an initial veloci ty o f 96ft/sec,is given by the equation h=-16t平方+96t+408,where h represents the height o f the object after t seconds. How long will...
What is the acceleration of a rock at the top of its trajectory when thrown straight upward? Explain whether or not the answer is zero by using the equation a=f/m as a guide to your thinking. 一枚石子被笔直的扔到空中,但它到达弹道顶端时它的加速度是多少?用公式 a=f/m 来好好思考一下...
A baseball is thrown straight upward. Describe the direction and magnitude of the velocity, force of gravity, and the varying air resistance force as the ball rises. Explain whether the net force incr If an object has a mass of 93 kg, the coeffici...
If an object is thrown in an upward direction from the top of a building 160 ft high at an initial speed of 30 mi/hr, what is its final speed when it hits the ground? If the object is thrown in an upward direction from the top of a building 160 ft hig...
Homework Statement While on planet X, an object is thrown vertically upward with an initial velocity of 5m/s. If this object returns to the point of release in 3s, what is the acceleration of a free falling object on this planet? Homework Equations a=vf-vi/t The Attempt at a... ...
an object, P is thrown vertically up and after 3s later another object ,Q is thrown up with the same initial speed of 20m/s and at the same position. find: a) the time, answer: [T][/P]= 3.54s, [T][/Q]= 0.54s [b]2. i use this formula v=u + at v=0 , u=20m/s a...
A stone is thrown upward from the ground with a velocity of 80 m/s. How long will it take to reach a point 3 meters above the ground on its way down? Calculate the height, in meters, of a cliff if it takes 2.35 \ s for a rock to hit...
Explain why the speed of an object decreases when an object is thrown upward using gravitational acceleration. If the object is being dragged up a frictionless incline. Why is the hanging weight (the second object) propo...
An object is thrown vertically upward. a) What are its velocity and acceleration when it reaches its highest altitude? b) What is its acceleration on its way down half a meter above the ground? An object is thrown vertically upward. a) What are its velocity and acc...
When an object is thrown upward, how much speed does it lose each second (ignoring air resistance)? What is the definition of average velocity? The figure shows the displacement-time graph of an object. What is the velocity of the object at 11 s and the value of b? a....