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2 years ago

13

A bicyclist was moving at a rate of 3 m/s, and then sped up to 4 m/s. If the cyclist has a mass of 100 kg, how much work was nee

ded to increase his velocity? (Hint: Use the work-kinetic energy theorem.) O A. 1250 J B. 450 J O c. 350 j D. 800 J

1 answer:

kotegsom [21]2 years ago

7 0

Answer:

i got b but urs is a little different tell me if right

Explanation:

i go 100 on my test

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a 0.199 kg snowball moving west makes an inelastic collision with a 2.89 kg box moving 0.523 m/s west. afterward,they move west

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Answer:

The initial velocity of the snowball was 22.21 m/s

Explanation:

Since the collision is inelastic, only momentum is conserved. And since the snowball and the box move together after the collision, they have the same final velocity.

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$\boxed{v_1=\frac{v_f(m_1+m_2)-m_2v_2}{m_1}}$

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$v_1=\frac{1.92*(0.199+2.89)-2.89*0.523}{0.199}$

$\boxed{v_1=22.21\:m/s}$

The initial velocity of the snowball is 22.21 m/s.

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2 years ago

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<em>so this is -4.1% error as the measured reading is less than the actual value</em>

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