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1 year ago

A body of mass 80kg moving with a velocity of 6m/s hits a stationary body

Physics

1 answer:

Sauron [17]1 year ago

8 0

Answer:

4 m/s

Explanation:

Conservation of momentum , mv

Before collision 80 kg * 6 m/s = 480 kg-m/s

after the collision,

the momentum is the same but the mass is 80+40 kg =120 kg

mv = 480

120 * v = 480

v = 4 m/s

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3 years ago

An apple dropped from the branch of a tree hits the ground in 0.5 s. If the acceleration of the apple during its motion is 10 ms

Ipatiy [6.2K]

Given that,

Time = 0.5 s

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(I). We need to calculate the speed of apple

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$v=u+at$

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t = time

Put the value into the formula

$v=0+10\times0.5$

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$s=ut+\dfrac{1}{2}gt^2$

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$s=0+\dfrac{1}{2}\times10\times(0.5)^2$

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(II). We need to calculate the average velocity during 0.5 sec

Using formula of average velocity

$v_{avg}=\dfrac{\Delta x}{\Delta t}$

$v_{avg}=\dfrac{x_{f}-x_{i}}{t_{f}-t_{0}}$

Where, $x_{f}$ = final position

$x_{i}$ = initial position

Put the value into the formula

$v_{avg}=\dfrac{1.25+0}{0.5}$

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Hence, (I). The speed of apple is 5 m/s.

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(III). The height of the branch of the tree from the ground is 1.25 m.

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3 years ago

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Answer:

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Answer:

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Answer:

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