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3 years ago

True or false:In free fall the object with less air resistance falls with a greater acceleration

2 answers:

6 0

Air resistance is an upward force, so it subtracts from the force of gravity. If two objects are falling, then the one with less air resistance feels more of the force of gravity, and falls with greater acceleration. <em>(True)</em>

This is not "free fall". The definition of 'free fall' is the situation where the ONLY force on the object is the force of gravity. If there's any air resistance, then it's not 'free fall'.

Leokris [45]3 years ago

3 0

It should be true, the air resistance of the other one would fall slower.

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2 years ago

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3 years ago

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A car accelerates in the +x direction from rest with a constant acceleration of a1 = 1.62 m/s2 for t1 = 20 s. At that point the

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Total displacement of the car: 405 m

Explanation:

The first part of the motion of the car is a uniformly accelerated motion, so we can use the suvat equation

$s_1=ut_1+\frac{1}{2}a_1 t_1^2$

where:

u = 0 is the initial velocity (the car starts from rest)

$t_1 = 20 s$ is the time elapsed in the 1st part

$a_1=1.62 m/s^2$ is the acceleration of the car in the 1st part

$s_1$ is the displacement of the car in the 1st part

Solving for $s_1$ ,

$s_1=0+\frac{1}{2}(1.62)(20)^2=324 m$

We can also find the velocity of the car after these 20 seconds using the equation:

$v_1 = u +a_1 t_1 = 0 + (1.62)(20)=32.4 m/s$

Now we can find the distance covered by the car in the 2nd part, where it decelerates after having seen the tree limb on the road. We can do it by using the suvat equation:

$s_2 = (\frac{v_1 + v_2}{2})t_2$