# Kinematics Last minute homework help

## Homework Statement

Hi I seriously need help in any of these remaining kinematics problems...I need to understand how to solve them too...Any help will be greatly appreciated.

1.) A bird watcher meanders through the woods, walking 0.40 km due east, 0.70 km due south, and 2.20 km in a direction 45.0° north of west. The time required for this trip is 2.50 h. Determine the magnitude and direction (relative to due west) of the bird watcher's

(a) displacement and
km (magnitude)
° (direction north of west)
(b) average velocity.
km/h (magnitude)
° (direction north of west)

Use kilometers and hours for distance and time, respectively

8.) A car drives straight off the edge of a cliff that is 50 m high. The police at the scene of the accident note that the point of impact is 140 m from the base of the cliff. How fast was the car traveling when it went over the cliff?
______(m/s)

16.) A soccer player kicks the ball toward a goal that is 29.0 m in front of him. The ball leaves his foot at a speed of 18.5 m/s and an angle of 33.6° above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The answer is not 18.5 m/s.)
________________m/s

## Homework Equations

x(t) = .5at2 + v0t + x0
x(t) = .5(v0+vf)t
vf^2= v^2+ 2ax
v= v0+ at

## The Attempt at a Solution

I seriously don't know how to do these remaining problems

Last edited:

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cepheid
Staff Emeritus
Gold Member
1a) Tell me, what is the definition of displacement? Based on that answer, how would you compute it?

displacement is the distance basically..it is x in the equations

cepheid
Staff Emeritus
Gold Member
displacement is the distance basically..it is x in the equations
Notice you're dealing with a problem in two dimensions. There's a key difference between displacement and distance...

cepheid
Staff Emeritus
Gold Member
uh, anyway, keep us posted with how you're doing with these problems...

here is an idea: why not just solve the problem and get it over with--that is why we come here in the first place, because we need to know how to get the answer(so we can learn from it), not to get a 4 hr/long distance/useless tutoring section.

cristo
Staff Emeritus