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artcher [175]
2 years ago
14

A dart player throws a dart horizontally at a velocity of 12.7 m/s. The

Physics
1 answer:
Igoryamba2 years ago
3 0

Answer:

Answer

Explanation:

It is given that,

The horizontal speed of a dart player =

12.4 m/s

The dart hits the board 0.32 m below the

height from which it was thrown.

We need to find how long it take the dart

to hit the board.

Let the time taken by the dart to hit the

board. Using second equation of motion

to find it.

1

y = ut +

2

=

at2

Put u = 0 and a=-g

-

-1

y =

1942

1

-0.32

=

x 9.8t2

2

2 x 0.32-0.32

=

t=

9.8

t= 0.255 s

Let x be the horizontal distance travelled.

It is calculated as follows:

X =

12.4 x 0.255

=

= 3.16 m

So, the dart will hit the board at a

distance of 3.16 m.

Muscardinus • Quality

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Read 2 more answers
At t=0 bullet A is fired vertically with an initial (muzzle) velocity of 450 m/s. When 3s. bullet B is fired upward with a muzzl
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Answer:

At time 10.28 s after A is fired bullet B passes A.

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Explanation:

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s=ut+0.5at^2 \\

Here s = h,u = 450m/s a = -g and t = t+3

Substituting

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Distance traveled by second bullet

Here s = h,u = 600m/s a = -g and t = t

Substituting

h=600t-0.5\times 9.81\times t^2=600t-4.9t^2\\\\h=600t-4.9t^2 \\

Solving both equations

600t-4.9t^2=420.6t-4.9t^2+1305.9\\\\179.4t=1305.9\\\\t=7.28s \\

So at time 10.28 s after A is fired bullet B passes A.

Height at t = 7.28 s

h=600\times 7.28-4.9\times 7.28^2\\\\h=4108.31m \\

Passing of B occurs at 4108.31 height.

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