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3 years ago

What is the momentum of a 750-kg car traveling at a velocity ofa 25 m/s?

Physics

2 answers:

Eddi Din [679]3 years ago

5 0

Momentum = mass x velocity 750x25 = 18750 kg-m/s.

Mars2501 [29]3 years ago

3 0

   Momentum = (mass) x (speed)

   = (750 kg) x (25 m/s)

   = 18,750 kg-m/s

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3 years ago

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3 years ago

A car has a kinetic energy of 1.9 × 10^3 joules. If the velocity of the car is decreased by half, what is its kinetic energy?

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Then, the velocity of the car is decreased by half: $v_2 = \frac{v_1}{2}$
so, the new kinetic energy is
$E_2 = \frac{1}{2}mv_2 ^2 = \frac{1}{2} m ( \frac{v_1}{2} )^2= \frac{1}{2}m \frac{v_1^2}{4}= \frac{E_1}{4}$
So, the new kinetic energy is 1/4 of the initial kinetic energy of the car. Numerically:
$E_2 = \frac{1.9 \cdot 10^3 J}{4}=475 J$

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4 years ago