2 years ago

A 68-kg skydiver has a speed of 52 m/s at an altitude of 670 m above the

Physics

1 answer:

Arlecino [84]2 years ago

4 0

Answer:

91936J

Explanation:

We know that kinetic energy= 1/2 mv^2

M= mass = 68 Kg

v= velocity= 52 m/s

KE=1/2 × 68 × (52)^2

KE= 1/2 × 68 × 2704

KE= 91936J

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A 1000 kg car is rolling slowly across a level surface at 1m/s, heading toward a group of small innocent children.

Ne4ueva [31]

Answer:

The force is -1620.73 N.

Explanation:

Given that,

Mass of car = 1000 kg

Velocity = 1 m/s

Distance = 2 m

Angle = 30°

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Using formula of work done

$W_{net}=K_{f}-K_{i}$

$F\times d=K_{f}-K_{i}$

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$F=-\dfrac{\dfrac{1}{2}\times1000\times(1)^2}{2\times\cos30}$

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Hence, The force is -1620.73 N.

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3 years ago

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Answer:

false

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