Homework Statement
Police lieutenants, examining the scene of an accident involving two cars, measure the skid marks of one of the cars, which nearly came to a stop before colliding, to be 85 m long. The coefficient of kinetic friction between rubber and the pavement is about 0.70. Estimate...
Homework Statement
A baseball is seen to pass upward by a window 21 m above the street with a vertical speed of 14 m/s. The ball was thrown from the street.
i already found out that initial speed is 24.65806156 and it passed the window after 1.086442406 s.
so, i need to figure out:
What...
i understand what formula to use now, but I am having trouble with the math because 0.5m=(-9.81Xt^2) / 2 and i do not know how to solve for t in that, since its squared, but over a fraction and multiplying with 9.81
Homework Statement
A ball is thrown straight upward and rises to a maximum height of 18 m above its launch point. At what height above its launch point has the speed of the ball decreased to one-half of its initial value?
Homework Equations
i don't know.
The Attempt at a Solution...
Homework Statement
If a salmon swims straight upward in the water fast enough to break through the surface at a speed of 2.5 meters per second, how high can it jump above water?
Homework Equations
i don't know, because all i know is speed.
The Attempt at a Solution
is...
Homework Statement
Calculate the hang time of an athlete who jumps a vertical distance of 0.58 meter.
Homework Equations
all i know is that d= 0.5m, and possibly initial velocity is 0? I am not sure.
The Attempt at a Solution
i tried using v = d/t, even though i doubted it...