Question

A ball is thrown with a speed of 10 m/s at an angle of 65. Which of the following statements describes the motion of the ball at the top of its trajectory?

A. The horizontal component of velocity is increasing.
B. The vertical acceleration is constant.
C. The vertical acceleration is zero.
D. The horizontal component of velocity is zero.

Answer 1

at the top of it's trajectory, the ball is going to stop for just an instant
it's motion is parabolic, like an upside-down parabola, so what do you think the answer is?

Answer 2

Thats too complicated!

Answer 3

could you explain what you don't understand?

Answer 4

well, the ball does not stop at the top of its trajectory...

Answer 5

right, it will keep moving horizontally

Answer 6

the vertical component however does

Answer 7

is A right?

Answer 8

what would make its horizontal component of velocity increase? you would need a force acting on the ball in the horizontal direction.

Answer 9

soo B?

Answer 10

@marius.roine what math have you taken so far? are you in calculus? it would definitely help

Answer 11

I am in precalculus... i need your help to get this question right @roadjester!

Answer 12

Ok, so do you know about derivatives or no? It is not strictly necessary though.

Answer 13

i dont know.. can you please tell me the right answer

Answer 14

Okay, let's go through each answer.
A. The horizontal component of velocity is increasing.

Answer 15

Uh, brb, have to do something, maybe 5 min ok?

Answer 16

ok, back
`

Answer 17

now then, the problem states that "A ball is thrown with a speed of 10 m/s at an angle of 65."

Answer 18

I read your answers and i understand now that the answer is B, thank you

Answer 19

have you learned about acceleration yet?