Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and v respectively. These trucks collide and stick together.

What is the speed of the trucks after the collision?

A

v/4

B

v/2

C

v

D

5v/4

How long do most select committees last?

6. Your friend says that when a car goes twice as fast, the braking distance doubles. Do you agree or disagree? Use evidence from this investigation to support your ideas.

A circuit has a resistance of 10ohmsband a current of 42 amps. caculate the voltage

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The best way to describe speed is a how the time is multiplied by the temperature b the time it takes to go a distance c time traved over a certain distance traved d the change in position e distance covered in a certain amount of time

What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?

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Oxygen makes up the largest part of living cells at 65%. What is the percentage of the second-most abundant element in living cells?