() what is the stil speed of the car?
(11) what is the maximum speed attained by the car
() part of the graph shows zero acceleration?
6. study the speed time graph
speed
(m/s)
time(s)
1) when is the maximum speed attained?
ii) what is the distance travelled from 0-2 seconds?
iii) what is the deceleration from a to b.
a stone is dropped into a well 44 m deep and the sound of splash is heard after 3.12 sec.
find the speed of sound in air.
7.
(3)
the given granh (fig) shows the disnlacement versne time relation for dictuhan

Explanation:

Where is the figure

i am not sure about this but it think

n=1/3.12= 0.320

v = 332m/s

right answer of speed of sound in air

time taken by stone to reach water is found by

44=1/2 gt^2

44=1/2×10×t^2

44=5t^2

8.8=t^2

t=2.96s

so time taken by sound to come up=3.12 - 2.96

= 0.16s

therefore

speed of sound =44/0.16

=275m/s

Time taken by the stone to reach the water surface can be calculated using the equation of motion s = ut + ½ gt2 Here u = 0, s = 44 m , g = 9.8 m/s2 So t = (2x44/9.8)½ = 2.996 s ≈ 3 s Therefore time taken by sound to travel this distance = 3.12 - 3 = 0.12 s Speed of sound in air = distance covered/Time = 44 m/ (0.12 s) = 366.7 m/s

answer:

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