Alessandra jumps on a trampoline. It takes her 1 second to
1 answer:
Answer:
The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
Explanation:
Given that,
Time = 1 sec
Height = 2 feet
We need to calculate the speed of Alessandra's motion
Using formula of speed
Where, v = speed
d = height
t = time
Put the value into the formula
The direction will be up ward.
Hence, The speed of Alessandra's motion is 2 ft/s up.
(C) is correct option.
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Answer:
250 N
433 N
Explanation:
N = Normal force by the surface of the inclined plane
W = Weight of the block = 500 N
f = static frictional force acting on the block
Parallel to incline, force equation is given as
f = W Sin30
f = (500) Sin30
f = 250 N
Perpendicular to incline force equation is given
N = W Cos30
N = (500) Cos30
N = 433 N
Since we are ignoring air resistance which is a non-conservative force, the potential energy will be completely converted into kinetic energy, resulting in a final kinetic energy of 
.