Question

A diver runs horizontally with a speed of 1.5 m/s off a platform that is 20 m above the water. what is his speed just before hitting the ground?

Answer 1

a ball 1 is thrown horizontally from the top of a building that is 50 meters tall. if another ball 2 is dropped at the same time as the first is released, which ball will hit the ground first?



A. ball 1

B. ball 2

c. they land at the same

D. depends of the initial velocity of ball 1

Answer 2

These two questions are really the same.

in the first the horizontal velocity remains 1.5 the whole time

then vertical problem
20 = 4.9 t^2
solve for t

Thern use that t to get v, speed down at ground
v = g t
v = 9.81 t

then
speed = sqrt (2.25 + v^2)

The second problem is trivial. The horizontal problem has nothing to do with the vertical problem. They fall at the same rate.

Answer 3

I still need help ebcause the answers are

A. 2.5 m/s
B. 5 m/s
C. 1.75 m/s
D. 2 m/s

NOT 19 M/S

Answer 4

A ball rolls off a 1 meters high desk and hits the ground 5 m away from the bottom of the desk. Determine the initial velocity of the ball. Free response

Answer 5

Your problems are all the same.

range = u t

t is time to fall one meter
h = (1/2) g t^2
so
t = sqrt (2 g h) remember that
so
t = sqrt (2*9.81*1)

then
5 meters = u t and we know t
so solve for u

Answer 6

u=5 meters?