Question

Jana hit a golf ball with an initial velocity of 102 ft per second at an angle of 67 degrees with the horizontal. After 2 second how far had the ball traveled horizontally? (79.7ft)? after 3 seconds how far has the ball traveled vertically? (137.6ft)?

Answer 1

@KyanTheDoodle

Answer 2

You need to find the total time it stays in the air, which would be finding the vertical velocity and using the kinematic equations to solve for t somehow

Answer 3

Oops just realized the time is given

Answer 4

If that's the case then all you need to do is find the horizontal velocity and plug in the known variables in the kinematic equations

Answer 5

I thought i did that, so are my answers not correct?

Answer 6

no their not

Answer 7

Can you show me how please?

Answer 8

yea @juanjohnguy show us how

Answer 9

Let me get the kinematic equations in front of me really quick

Answer 10

thank you

Answer 11

Since we only care about the horizontal distance that the ball travels in the first one, we know that there is no horizontal acceleration and so we can use the constant velocity equation.....which is something like x=x(naught) +vt

Answer 12

Which should give you the solution for the first question. It seems like I got the same answer as you did for the first one

Answer 13

So 79.7 is correct? at least i did something right lol.
But i'm very unsure about the vertical one.

Answer 14

The wording for the second quest is weird since its a little vague

Answer 15

I would imagine you would need to use the the constant acceleration kinematic equations to solve this one

Answer 16

Half of these questions are pretty vague. How do i do that

Answer 17

Let me do a little calculation and see where my numbers fall very quickly

Answer 18

okay thank you

Answer 19

Ok so it looks like my answer is close to yours. The only thing I am not sure about is whether it is asking for the height the ball is at at 3 seconds, or the distance that the ball travels, which would include the vertical distance going up to the peak when it's velocity is zero and it reaches its max height + the little distance it goes when it falls back down

Answer 20

I say that because I calculated that it reaches it's max height at about 2.915 seconds

Answer 21

But the quest is asking for when t = 3 seconds

Answer 22

and in the 0.085 extra seconds, the ball falls downward from it's max height, thus I am not sure if you need to add the distance it travels when it falls