who is better john cena or brock lesnar​

Answers 1

Answer:

Explanation: they are the

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Draw a graph of x+y=10,2x-y=5 and find the point of intersection​

Answer: the point of intersections are x=5 and y=5.

Step-by-step explanation:

2. Radhika is an aspiring writer. She wants to create an account in a social networking site where she can follow some well known writers and receive their messages. Help her to choose one of the best online social networking service for the same.​

Answer: it can be twitter facebook and google scholar

Explanation:

it can be twitter facebook and google scholar

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A car of mass 1000 kg moving with velocity 54 km/h stops in 5 seconds. Calculate the force applied by brakes. Give the solution with the answer.​

Answer:

-3000N

Explanation:

u=54kmph=15m/s

v=0m/s

m=1000kg

t=5s

a= (v-u)/t

= (0-15)/5

= -15/5

= -3 m/s^2

F= ma

F= 1000*(-3)

= -3000N

(here the negative symbol represents that the force was applied opposite to the direction of motion.)

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Answer:

Force applied on brakes will be 3000 N

Explanation:

Given data,

mass of the car m = 1000 kg

initial velocity of the car u = 54 km/h

let us convert u in SI units

[tex]u = \frac{54 \times 1000m}{60 \times 60s} [/tex]

[tex]u = 54 \times \frac{5}{18} [/tex]

[tex]u = 3 \times 5 = 15m {s}^{ - 1} [/tex]

final velocity v = 0 as it stops.

time taken t = 5 s

from Newton's second law force is mass times acceleration

[tex]f = ma[/tex]

but

[tex]a = \frac{v - u}{t} [/tex]

[tex]f = m \times \frac{v - u}{t} [/tex]

substituting all values,

[tex]f = 1000 \times \frac{0 - 15}{5} [/tex]

[tex]f = 1000 \times ( - 3)[/tex]

[tex]f = - 3000 [/tex]

Thus force applied on brakes will be 3000 N. here negative sign indicates force applied against direction of motion of body.

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