3 years ago

1. Why is the acceleration in the example negative?

1 answer:

Reika [66]3 years ago

6 0

Answer:

Because the velocity v (As a Vector ) is going opposite direction ( -X axis ) .

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snow_lady [41]

Answer:

The velocity of the truck after this elastic collision is 15.7 m/s

Explanation:

It is given that,

Mass of the car, $m_1=1.1\times 10^3\ kg$

Mass of the truck, $m_2=2.3\times 10^3\ kg$

Initial velocity of the car, $u_1=22\ m/s$

Initial velocity of the truck, u₂ = 0

After the collision the velocity of the car is, v₁ = -11 m/s

Let v₂ is the velocity of the truck after this elastic collision. Using the conservation of momentum as :

$m_1u_1+m_2u_2=m_1v_1+m_2v_2$

$1.1\times 10^3\times 22+0=1.1\times 10^3\times (11)+2.3\times 10^3\times v_2$

$v_2=15.7\ m/s$

So, the velocity of the truck after this elastic collision is 15.7 m/s. Hence, the correct option is (c).

4 0

3 years ago

Allushta [10]

c.magnetic induction hope this helps

4 0

3 years ago

hoa [83]

V=d/t
V=?
d=400m(4)
=1600m
t=6 min.
=360 s

V=1600m/360s
V=4.4m/s

3 0

3 years ago

konstantin123 [22]

Don’t know sorry I’m just trying not a good person

5 0

3 years ago

kifflom [539]

A ball hit by a man is stronger than a ball hit by a man because the man uses more force when hitting the ball than the boy does.

5 0

3 years ago