Answer:
<em><u>A balance and a beaker of water!</u></em>
Explanation:
Krishne wants to measure the mass and volume of a key. The tools that are to be used are – a balance and a beaker of water.
Mass will be represent with the amount of matter that is in an object. This will be measured in terms of kilogram. The mass can easily be measured with balance.
Volume is the quantity of matter that is in the object. This is measured in terms of cubic meter. If you drop the key in a beaker of water, the water inside the beaker will increase and this increases the volume of water that will be equal to volume of key.
Answer:
The ratio of the power generated by the engines are 
(b) is correct option.
Explanation:
Given that,
Mass of Tesla = 2000 Kg
Torque = 400 Nm
Mass of Mercedes = 1.5 M Tesla
The Benz engine produces 50% more torque than the Tesla.
We need to calculate the power generated by the engines 6 seconds after a start from rest
Using formula of power

We know that,



Put the value of F and v in equation (I)


Here, r and t are same for both bodies.

We need to calculate the ratio of the power generated by the engines
Using formula of power

Put the value into the formula


Hence, The ratio of the power generated by the engines are 
D. Power. The unit of power is watt.
C. You’re welcome
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