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3 years ago

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A cyclist moves at 10 m / s for 5 minutes and at 18 m / s for 6 minutes in the same direction and direction. Get the average spe

ed of this movement.
A.14.4 m/s
B.2.5 m/s
C.25.0 m/s
D.31.6 m/s
E.None of the above

1 answer:

andre [41]3 years ago

7 0

total speed/total time=28/11=approx 2.8, just under.

makes it b, surprisingly

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Train cars are coupled together by being bumped into one another. Suppose two loaded train cars are moving toward one another, t

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0.13 m/s

Explanation:

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For elastic collision

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3 years ago

Read 2 more answers

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3 years ago

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Answer:

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Explanation:

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3 years ago

A student throws a set of keys vertically upward to her sorority sister, who is in a window 3.50 m above. The second student cat

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Answer:

a) 8.58 m/s upward

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Explanation:

Let gravitational acceleration g = -9.81m/s2. This is negative because it deceleration the upward motion of the key.

(a)We have the following equation of motion

$s = v_0t + gt^2/2$

where $v_0$ is the initial upward velocity of the keys, t = 1.1s is the time it takes for the keys to travel a distance of s = 3.5 m

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$3.5 = 1.1v_0 - 5.94$

$1.1v_0 = 3.5 + 5.94 = 9.44$

$v_0 = 9.44 / 1.1 = 8.58 m/s$

So the keys were thrown initially upward with a speed of 8.58 m/s

(b) If the initial velocity of the key is 8.58 m/s and it is subjected to a deceleration of 9.81m/s2 for 1.1s then the velocity right at the 1.1s instant is

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So they keys would have a downward speed of 2.211 m/s

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3 years ago