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Hey can someone please help me with this question no. 17 about projectile motion.

A ball is dropped from a lookout 180 meters high. At same time, a stone is fired vertically upwards from the valley floor with speed V m/s. Take g = 10m/s^2. a) Find for what values of V a collision in the air will occur. Find, in terms of V, the time and the height when collision occurs, and...

The temperature at each instant of a day can be modelled by a SHM function oscillating between 9 degrees at 4:00 AM and 19 degrees at 4:00PM. Find, correct to the nearest minute, the times between 4:00 AM and 4:00 PM when the temperature is 14 degrees. The correct answer is 10AM. I am...

So the question is as follow: If y=In(tan2x), show that dy/dx = 2sec2x cosec2x My attempt: =1/tan2x * 2sec^2 2x I cant get it into the format they want. Any help would be appreciated.

K i have to integrate cos^3 x dx. The answer i get is Sinx - Sin^3x/3 +C. But the book says; 1/4( Sin3x/3 + 3 Sinx) +c :confused:

as the question says. Was wondering what other people do?. I myself write mine :sleep:

Use the mass of earth to determine the gravitational acceleration acting on a meteor of mass 1 tonne at an altitude of 2300KM above the earth surface. I tried using g = Gm/r*2 but got stuffed up answer :(

Guys any thoughts. Need to write long response on it. Any help appreciated. THE DOOR Go and open the door. Maybe outside there’s a tree, or a wood, a garden, or a magic city. Go and open the door. Maybe a dog’s rummaging. Maybe you’ll see a face, or an eye, or the picture of a picture. Go...