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2 years ago

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A car is moving 18 m/s to the east. if it takes the car 5 seconds to reach a velocity of 19 m/s to the east, what is its acceler

ation?
A. 1 m/s2 east
B. 0.2 m/s2 west
C. 0.2 m/s2 east
D. 5 m/s2 east

2 answers:

almond37 [142]2 years ago

5 0

<span>C. 0.2 m/s2 east

Hope it helps!
</span>

kakasveta [241]2 years ago

4 0

<h2>Option C is the correct answer.</h2>

Explanation:

We have equation of motion v = u + at

Initial velocity, u = 18 m/s to east

Final velocity, v = 19 m/s to east

Acceleration, a = ?

Time, t = 5 s

Substituting

v = u + at

19 = 18 + a x 5

1 = 5a

a = 0.2 m/s²

Since the velocity direction is towards east, direction of acceleration is also towards east.

So acceleration is 0.2 m/s² towards east.

Option C is the correct answer.

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At the beginnig, the total momentum of the two is zero, since they are at rest:

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While the final momentum, after the astronaut throws the box, is:

$p_f=mv+MV$

where

m = 11 kg is the mass of the box

M = 79 kg is the mass of the astronaut

v = -0.45 m/s (to the left) is the velocity of the box (we take left as negative direction)

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