Answer
given,
vertical speed of stone,v = 12 m/s
height of the cliff = 70 m
a) time taken by the stone to reach at the bottom of the cliff
We know that,
S = u t + 1/2 a t²
- 70 = 12 t - 0.5 x 9.8 t²
4.9 t² - 12 t - 70 = 0
solving the equation
t = 5.2 s (neglecting the negative value)
b) again using equation of motion
v = u + a t
v = 12 - 9.8 x 5.2
v = -38.96 m/s
ignoring the negative sign
magnitude of velocity is equal to 38.96 m/s
c) total distance travel by the stone
vertical distance covered by the stone
v² = u² + 2 g h
0 = 12² - 2 x 9.8 x h
h = 7.34 m
to reach the stone to the same level distance travel be doubled.
Total distance travel by the stone
H = h + h + 70
H = 7.34 x 2 + 70
H = 84.7 m.
Answer:
TRUE?
Explanation:
Im not really sure what your question is.
Answer:
A
Explanation:
A is correct as Velocity includes the + and - signs, indicating the direction followed by the magnitude which is the speed.
B is Wrong. Velocity is <em>d</em><em>i</em><em>s</em><em>p</em><em>l</em><em>a</em><em>c</em><em>e</em><em>m</em><em>e</em><em>n</em><em>t</em><em> </em>divided by time.
C Im not sure, Sorry..
D is wrong. Same explanation as B
Answer:
gravitational potantional energy
Explanation:
ill try to link a source!
edit: https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/14.3/primary/lesson/potential-energy-ms-ps#:~:text=Potential%20energy%20due%20to%20the,is%20called%20gravitational%20potential%20energy.
