**Answer:**

<h2>A. 80 m/s </h2>

**Explanation:**

The velocity of the spacecraft can be found by using the formula

p is the momentum

m is the mass

From the question we have

We have the final answer as

<h3>80 m/s</h3>

Hope this helps you

Calorimeters can be improved by impeding the loss of heat to the surroundings. A few things can improve this:

better insulation

less surface area to the surroundings

accurate heating

better stirring/mixing mechanism

This is a **Wheatstone bridge**, and the ratio of R2 to R1 equals the ratio of Rx to R3. As a result, if R2 is increased, R3 should be reduced by a **factor** of two.

<h3>Explain Wheatstone bridge?</h3>

A** Wheatstone bridge **is a type of electrical circuit that is used to measure an unknown **electrical resistance** by balancing two legs of a bridge circuit, one of which contains the unknown component.

The Wheatstone bridge circuit can be used to compare an unknown resistance RX to others of known value, such as R1 and R2, which have **constant values** and R3 which can be variable.

If we connected a voltmeter, ammeter, or galvanometer between points C and D, and then changed **resistor R3** until the meters read **zero**, the two arms would be balanced, and the value of RX (substituting R4) would be known as indicated.

To learn more about **Wheatstone bridge** refer to :

brainly.com/question/15225070

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