External fertilization happens best in water than old land. This is because the sperm traveling to the eggs need a way to get there. Sperm cannot fly or crawl, they use water as a media to travel through.

Answer:

Explanation:

Using equations of motion:

(a)

v=u+at

∴0=19.4−8.57t

∴t=19.4/8.57

=2.3s

B. Using s= ut + 1/2 at²

19.4(2.3)-1/28.57(2.3)²

= 21.92rad

**Answer:**

Equal

**Explanation:**

Energy can neither be destroyed nor be created. It can only be transformed from one form to otherm

So by this, we can say that the above should be equal.

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With best wishes,joel

**Answer:**

The speed of the 8-ball is 2.125 m/s after the collision.

**Explanation:**

<u>Law Of Conservation Of Linear Momentum</u>

The total momentum of a system of masses is conserved unless an external force is applied. The momentum of a body with mass m and velocity v is calculated as follows:

P=mv

If we have a system of masses, then the total momentum is the sum of all the individual momentums:

When a collision occurs, the velocities change to v' and the final momentum is:

In a system of two masses, the law of conservation of linear momentum is simplified to:

The m1=0.16 Kg 8-ball is initially at rest v1=0. It is hit by an m2=0.17 Kg cue ball that was moving at v2=2 m/s.

After the collision, the cue ball comes to rest v2'=0. It's required to find the final speed v1' after the collision.

The above equation is solved for v1':

**The speed of the 8-ball is 2.125 m/s after the collision.**

**Answer:**

Option D: More than 90

**Explanation:**

Thickness probably depends on temperature. The higher the temperature, the more aliens we expect to be thin.