Answer:
0.8s
Explanation:
Given parameters:
Height of shelf = 3m
Unknown:
Time it will take to hit the ground = ?
Solution:
To solve this problem, we use the expression below;
x = ut + gt²
x is the height
u is the initial velocity = 0m/s
g is the acceleration due to gravity = 9.8m/s²
t is the time taken = ?
Now insert the parameters and solve for t;
3 = (0 x t) +( x 9.8 x t²)
3 = 4.9t²
t² = 0.6
t = 0.8s
Hi there!
We can begin by deriving the equation for how long the ball takes to reach the bottom of the cliff.
There is NO initial vertical velocity, so:
Rearrange to solve for time:
Plug in the given height and acceleration due to gravity (g ≈ 9.8 m/s²)
Now, use the following for finding the HORIZONTAL distance using its horizontal velocity:
≈40.8kg
this is to take up space
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
m
=
W
g
=
400
N
9.8
m/s
2
≈
40.8
kg
