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3 years ago

Two cars are moving in the same direction at the same speed of (72.0 kmh). What is

Physics

1 answer:

Licemer1 [7]3 years ago

6 0

Answer:

0 km/h

Explanation:

Relative speed is the speed of a moving body with respect to another.

When two bodies move in the same direction then the relative speed is calculated as difference of their speeds.

In this case;

The two cars have the same speed. The relative speed will be;

72 km/h -72 km/h = 0 km/h

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3 years ago

A 15 g toy car moving to the right at 24 cm/s has a head-on nearly elastic collision with a 21 g toy car moving in the opposite

11111nata11111 [884]

Answer:

The speed of the second toy car after collision is $v_2 = 0.155 \ m/s$

Explanation:

Let movement to the right be positive and the opposite negative

From the question we are told that

The mass of the car is $m_1 = 15 \ g = \frac{15}{1000} = 0.015 \ kg$

The initial velocity of the car is $u_1 = 24 \ cm /s = 0.24 m/s$

The mass of the second toy car $m_2 = 21 g = 0.021 \ kg$

The initial velocity of the car is $u_2 = 31 \ cm/s =- 0.31 m/s$

The final velocity of the first car is $v = 41cm/s = - 0.41 m/s$

From law of momentum conservation we have that

$m_1 u_1 + m_2 u_2 = m_1 v_1 + m_2 v_2$

substituting values

$(0.015* 0.24) +( 0.021 * -0.31) = (0.015 * -0.41 ) + 0.021 v_2$

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3 years ago