Answer:
V = 10.88 m/s
Explanation:
V_i =initial velocity = 0m/s
a= acceleration= gsinθ-cosθ
putting values we get
a= 9.8sin25-0.2cos25= 2.4 m/s^2
v_f= final velocity and d= displacement along the inclined plane = 10.4 m
using the equation
v_f= 7.04 m/s
let the speed just before she lands be "V"
using conservation of energy
KE + PE at the edge of cliff = KE at bottom of cliff
(0.5) m V_f^2 + mgh = (0.5) m V^2
V^2 = V_f^2 + 2gh
V^2 = 7.04^2 + 2 x 9.8 x 3.5
V = 10.88 m/s
Answer:
(a) V = 36 v
(b) V = 18v
Explanation:
Check the attached file for the explanation
Answer:
The distance close to the sidewalk can the flower pot fall is
x = 14.83 m
Explanation:
Given
Δt = 0.300 s
d = 19.6 m
h = 1.79 m
Knowing as the velocity of the sound as a 330 m/s
t = (19.6 - 1.79)m / 330 m/s
t = 0.0539 s
Total time
tₙ = 0.3 + 0.0539 = 0.3539 s
Time for flower-pot
s = ¹/₂ * g * t²
tₐ = √[(2 * 17.81m)/9.81m/s²]
tₐ = 1.34 s, t' = 0.3539
1.34 - 0.3539 = 0.9861 s
19.6 m - x = ¹/₂* g * t ²
x = 19.6 - ¹/₂ * (9.81) * (0.9861)²
x = 14.83 m
if rebecca stands in front of david at a distance of do and david perceives the position of rebecca at di, di will be +84 cm
<h3>What is focal length ?</h3>
How strongly light converges or diverges depends on an optical system's focal length, which is the inverse of optical power. A system with a positive focus length is said to converge light, whereas one with a negative focal length is said to diverge light.
focal length = +60 cm
magnification m = -0.40
focal length being positive an magnification negative.
given lens is a convex lens.
for a lens
m = di/do and 1/f = (1/di) - (1/do)di
= -0.4do1/f = (1/-0.4do) - 1/do do
= -210 cmdi = -0.4 * -210
di = +84 cm
To learn more about focal length go to - brainly.com/question/25779311
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initial velocity=0m/s
acceleration=4.2m/s^2
time taken =5s
then final velocity
v=u+at
or, v=0+4.2*5
so final velocity is 21m/s