Answer:
u = 29.22 m/s
Explanation:
distance (s) = 58.52 m
coefficient of kinetic friction (k) = 0.75
final velocity (v) = 0 m/s
acceleration due to gravity (g) = 9.8 m/s^{2}
How fast was she driving (u)
we can get how fast she was driving by using the formula below
s = ut - 
...equation 1
where
- s = distance
- u = her initial velocity
- a = acceleration =
- k = coefficient of kinetic friction
- g = acceleration due to gravity
from v = u - at (recall that v = 0)
0 = u - at, therefore t = u/a = u/kg
now substituting the required values above into equation 1 we have
s = 
s = 
u = 
u = 
u = 29.22 m/s
The Correct answer would be D. Work equals force times distance.
Since there is no air resistance, gravity is the only force acting on the two objects - the bowling ball and the arrow. Therefore, they will hit the ground at the same time. Thus the answer is D. Both hit the ground at the same time. Hope this helped and have a great day!
Answer:
1. 2.67 s
2. 0.1 m/s²
Explanation:
1. Determination of the time taken for the penguin to fall.
Height (h) of cliff = 35 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
35 = ½ × 9.8 × t²
35 = 4.9 × t²
Divide both side by 4.9
t² = 35 / 4.9
Take the square root of both side
t = √(35 / 4.9)
t = 2.67 s
Thus, it will take 2.67 s for the penguin to fall onto the head of a napping polar bear.
2. Determination of the acceleration of the penguin.
Initial velocity (u) = 0 m/s.
Final velocity (v) = 2 m/s.
Time (t) = 20 s
Acceleration (a) =?
a = (v – u)/t
a = (2 – 0)/ 20
a = 2 / 20
a = 0.1 m/s²
Thus, the acceleration of the penguin is 0.1 m/s²
