Answer:
The force needed will be 5000[N]
Explanation:
Using the Newton's second law we have:
![F = m*a\\where\\F = force [N]\\m = mass [kg]\\a= acceleration [m/s^2]\\Replacing we have\\F = 0.025[kg]*200000[m/s^2]\\F = 5000 [N]](https://tex.z-dn.net/?f=F%20%3D%20m%2Aa%5C%5Cwhere%5C%5CF%20%3D%20force%20%5BN%5D%5C%5Cm%20%3D%20mass%20%5Bkg%5D%5C%5Ca%3D%20acceleration%20%5Bm%2Fs%5E2%5D%5C%5CReplacing%20we%20have%5C%5CF%20%3D%200.025%5Bkg%5D%2A200000%5Bm%2Fs%5E2%5D%5C%5CF%20%3D%205000%20%5BN%5D)
82 ÷ 6.5 = 12.615384615384... repeating
round = 12.6
12.6 · 6.5 = 81.9
round = 82
She went an average of 12.6 km an hour
Hope this helps! ;)
<span>Since the trains area headed in completely opposite directions, the rate at which they gain distance from each other is simply equal to the sum of the magnitudes of their velocities, in this case 85 + 75 = 160 miles per hour. Therefore, the amount of time it will take for them to be 352 miles apart is 352/160 = 2.2 hours, or 2 hours and 12 minutes.</span>
Answer:
Explanation:
The force of kinetic friction on the block is defined as:
Where 
is the coefficient of kinetic friction between the block and the surface and N is the normal force, which is always perpendicular to the surface that the object contacts. So, according to the free body diagram of the block, we have:
Replacing this in the first equation and solving for :
