Projectile Motion

Question 1

3 assumptions and why

Answer 1

1) point mass (no surface area acting on it)
2) no air resistance as a result
3) not powered

Would breakdown for a parachute as air resistance as a considerable role to play

Question 2

How to find the time of flight if it doesn’t start on origin so say 10m up?

Answer 2

1) first way is to find time it takes to top, double and now you have time it takes to retune back to displamcent y it was.
- now find how long it will take to go down and add, use same velocity starting for y

2) but easier ine calcuktion way is to find the displacement y it will end up in, and take up to be positive like normal You’ll see quadratic and it should work

Question 3

Best angle for best range?

Answer 3

45, can derribe by differentiating

Question 4

What’s advantage of throwing something lower that will travel same distance / higher

Answer 4

Lower will be faster due to cos theta, so arrives quicker, but higher is slower and easier to catch