A bullet travels at 855 m/s. How long will it take a bullet to go 2 km?

Mathematics

2 answers:

AleksandrR [38]3 years ago

4 0

Answer:

$\huge\boxed{\sf t = 2.34\ seconds}$

Step-by-step explanation:

Given Data:

Speed = v = 855 m/s

Distance = S = 2 km = 2000 m

Required:

Time = t = ?

Formula:

v = S/t

Solution:

Rearrange the formula

t = S/v

t = 2000/855

t = 2.34 seconds

$\rule[225]{225}{2}$

Hope this helped!

Andrew [12]3 years ago

4 0

Answer:

2.36 seconds

Step-by-step explanation:

it takes 1.18 seconds to go 1 km so for 2 you multiply x 2 and get 2.36.

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Write each rational number as a terminating decimal. 1. 19/20 2. -1/8 3. 17/5

Dima020 [189]

19/20= 0.95
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HOPE THIS HELPS!

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4 years ago

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tiny-mole [99]

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"A ping pong ball has a 75% rebound ration". We can infer that our common ratio, r, is 75% which is 0.75.

"When you drop it from a height of k feet...", this means the first height you drop it from, a.k.a, the first term.

Now going back to the expression, the nth-term = $a*r^{n-1}$ , we can substitute our common ration, 0.75 with r, and our 1st term, k, with a. This becomes: $k * 0.75^{n-1}$ . This becomes our expression.

a. The highest height achieved by the ball after six bounces. Our nth-term here is 6, so let's use our expression to find the 6th term. $n_{6} = 235 * 0.75^{6-1} = 235*0.75^{5} = 235*0.2373 = 55.7655ft$

b. The total distance travelled by the ball when it strikes the ground for the 12th time. This involves the use of the sum of elements in the geometric progression. The formula for that is $\frac{a(1 - r^{n})}{1-r}$ , provided that r is less than 1, which it is in this case, since 0.75 is less than one. Our nth-term here is 12, so we substitute.