ok I've been trying to figure out this problem for about an hour :/
A golfer drives a ball at an angle of 30 degrees with the horizontal at an initial speed of 60m/sec. How high does the ball rise?
ok I am pretty sure this is a projectile problem.
Vf=0(?)
Vh=52m/s
Vv=30m/s (i used sin...
how can you tell when to use -9.8m/s^2 or +9.8 as your acceleration for a falling object? i have a problem that says " A ball is thrown upward from the top of a 25 m tall building." would that be -9.8 since the ball is being thrown up(+) and gravity is pulling it down?(-)
so the equation would be (25m/s)(t)+1/2(9.8)t^2=(25m/s)(t)+1/2(-9.8)t^2?
(1st ball and 2nd ball respectively)
what do i do with the 210 m?
btw, my teacher gave us an answer sheet and the answer is -10m
ive been having difficulty with this problem also:
A ball is thrown downward with an initial speed of 25m/s from the top of a 210 m tall building. At the same time, another ball is thrown upward from ground level with a speed of 25m/s. At what distance from the bottom of the two balls pass...
WOW i mistyped the question, I am really sorry about that. the window is actually 1.5 m high. This is what the real problem should say:
A brick is dropped from the roof of a building. Twenty meters below the point of release is the top of a window. How long will it take the brick to pass in...
more kinetics :(
sigh here's another one i thought i knew how to do but i ended up with the wrong answer.
A brick is dropped from the roof of a building. Twenty meters below the point of release is the top of a window. How long will it take the brick to pass in front of the window which is...
ok i counted the 25m/s as initial velocity and the acceleration 0 for car B. I set car A and B equal using the equation d=vi(t)+1/2(a)(t)^2.
so, 1/2(5)t^2=20+25t
then , 2.5(t)^2-25(t)-20=0 and use the quadratic formula? is that it?
so i should take that car B has an acceleration of 0? I am still confused on what constant speed is - does that mean average velocity, final velocity, or initial velocity?
nevermind i finally figured the problem out. but i have another one I am having trouble with.
Car B is moving at a constant speed of 25m/s along a straight road. Car A starts from rest and moves in the same direction when B is 20.0 m ahead. If A accelerates at a rate of 5 m/s^2, how far...