- #1
Eiano
- 12
- 0
Hello!
I've been working on this problem for a while and our book doesn't have a solutions manual. It has 4 parts to it and I've solved 2 already, (I think) and the last 2 are just getting to me.
-A ball is thrown from the top of a building and is given an initial velocity of 30 m.s upward. The building is 60M high.
1). Determine the time needed for the stone to reach its max height
vf=at+vi
-30=-10t, t=3
2). Maximum height?
d= .5AT^s +viT
.5(-10)(3)^2+30(3)
= -5(9)+ 90
=15M
Velocity of the ball just before it hits the ground and the total time the ball is in the air?
What i did was
x=voT +.5AT^2 and solved for T but that can't be right because the answer i get is less that 7 seconds, and question following this says find the velocity and position at 7 sec. so it has to be AT LEAST 7 sec.
then i substituted that t for v=vo+at. so really, the 4th question is not the problem it's the 3rd.
Any help is appreciated
I've been working on this problem for a while and our book doesn't have a solutions manual. It has 4 parts to it and I've solved 2 already, (I think) and the last 2 are just getting to me.
-A ball is thrown from the top of a building and is given an initial velocity of 30 m.s upward. The building is 60M high.
1). Determine the time needed for the stone to reach its max height
vf=at+vi
-30=-10t, t=3
2). Maximum height?
d= .5AT^s +viT
.5(-10)(3)^2+30(3)
= -5(9)+ 90
=15M
Velocity of the ball just before it hits the ground and the total time the ball is in the air?
What i did was
x=voT +.5AT^2 and solved for T but that can't be right because the answer i get is less that 7 seconds, and question following this says find the velocity and position at 7 sec. so it has to be AT LEAST 7 sec.
then i substituted that t for v=vo+at. so really, the 4th question is not the problem it's the 3rd.
Any help is appreciated