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1. Homework Statement
See attachment, it is the question sheet.
2. Homework Equations
v_{f}^2=v_{i}^2+2ad
d=vit+1/2at^2
v_{f}=v_{i}+at
d=v_{i}t1/2at^2
d=v_{av}t
3. The Attempt at a Solution
1. An object such as a ball let go by a person's hand falling vertically downward toward earth has a velocity and acceleration vector in the same direction. An object such as a cannonball launched vertically upward will have a velocity vector upward and an acceleration vector down due to gravity which means the velocity and acceleration vectors are in opposite directions momentarily.
2. Both bullets hit the ground at the same time because both objects have the same initial velocity of zero and acceleration of gravity in the ycomponent. The xcomponent does not affect the ycomponent which is why it is ignored.
3. See attachment with no title.
4. The stone thrown downward will hit the ground first. Both stones hit the ground at the same speed.
5. 15^2+35^2=r^2
38m=r
The magnitude of the football's displacement is 38m.
6. vf=vi+at
vf=09.8(2.5)
vf=24.5m/s
The velocity of the fish is 25m/s down at 2.5 seconds after being dropped.
b)d=vit1/2at^2
d=0+4.9(2.5)^2
d=11.15m
The pelican was 11.15m above the water when it dropped the fish.
7. See attachment
Not sure how to do 8, 9 or 10.
See attachment, it is the question sheet.
2. Homework Equations
v_{f}^2=v_{i}^2+2ad
d=vit+1/2at^2
v_{f}=v_{i}+at
d=v_{i}t1/2at^2
d=v_{av}t
3. The Attempt at a Solution
1. An object such as a ball let go by a person's hand falling vertically downward toward earth has a velocity and acceleration vector in the same direction. An object such as a cannonball launched vertically upward will have a velocity vector upward and an acceleration vector down due to gravity which means the velocity and acceleration vectors are in opposite directions momentarily.
2. Both bullets hit the ground at the same time because both objects have the same initial velocity of zero and acceleration of gravity in the ycomponent. The xcomponent does not affect the ycomponent which is why it is ignored.
3. See attachment with no title.
4. The stone thrown downward will hit the ground first. Both stones hit the ground at the same speed.
5. 15^2+35^2=r^2
38m=r
The magnitude of the football's displacement is 38m.
6. vf=vi+at
vf=09.8(2.5)
vf=24.5m/s
The velocity of the fish is 25m/s down at 2.5 seconds after being dropped.
b)d=vit1/2at^2
d=0+4.9(2.5)^2
d=11.15m
The pelican was 11.15m above the water when it dropped the fish.
7. See attachment
Not sure how to do 8, 9 or 10.
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