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4 years ago

8

An autographed baseball rolls off of a 0.91 m high desk and strikes the floor 0.84 m away from the desk. How fast was it rolling

on the desk before it fell off? The acceleration of gravity is 9.81 m/s2 .

1 answer:

Rudik [331]4 years ago

4 0

The initial velocity (its speed before falling off) is approximately 1.95 m/s

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Answer:

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Explanation:

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3 years ago

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hichkok12 [17]

Answer:

a = 64 ft / s²

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x = 3 in (1foot/12 in) =0.25 foot

k = 0.3 / 0.25

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3 years ago

3. Mr. Hogan in his 3000 kg truck is driving down

S_A_V [24]

Answer:

$|I|=21,000\ kg.m/s$

<em>Correct answer: Option E</em>

Explanation:

<u>Impulse and Momentum </u>

The Impulse is defined as the change of momentum of an object in a certain interval. The formula is:

$I=\Delta p=p_f-p_o$

Where pf and po are the final and initial momentums respectively. Knowing that for m= mass of the object and v=velocity (or speed in the scalar form)

$p=m.v$

Thus

$I=m(v_f-v_o)$

Mr. Hogan's 3000 kg truck is initially at 36 m/s and later slows down to 29 m/s. We compute the impulse as follows

$I=3000\ kg(29\ m/s-36\ m/s)$

$I=3000(-7)\ kg.m/s$

$I=-21,000\ kg.m/s$

We are asked for the magnitude, thus

$|I|=21,000\ kg.m/s$

Correct Answer: Option E

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Romashka [77]

Answer:

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