A few days ago
Ojcc

Which formula should I use?

A force of 17N is applied to a 6KG block which is at rest. Find:

A] Acceleration

B] Velocity

C] Distance After 9 seconds.

I solved A with the formula Force divided by Mass. [a=F/m]

17/6=2.83 m/s2

Solved B with the formula: Initial Velocity plus Acceleration times Time [Vf=Vi+a(t)]

0 + 2.83(9) = 25.47m/s

Now, for the distance (c) i have two formulas. the first one is:

Distance = Velocity * Time

and

Distance = Initial Velocity (time) + 1/2 a (time)2

Which formula is the right one to use?

Top 2 Answers
A few days ago
Chris C

Favorite Answer

The second distance formula is the correct one to use.
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A few days ago
song fai
you should use:

D= initial velocity*time + 1/2 a*t^2

the first formula is only for constant velocity which means a=0

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