Answer:
4.5454 s
Explanation:
Final velocity is 0 m/s..
Initial velocity is 25 m/s..
we have to find out the time..
so to do that we must substrate initial velocity from the final velocity and then divide the answer by the deceleration..
After doing that I got the answer.. 4.5454 S
Hope this helped you.. Have a nice day dear ❤️..
Answer: Mercury is rarely used in thermometers that take body temperatures because it is toxic, accidentally if by any chance a thermometer breaks orleaky, mercury gets inside body and can cause harm.
Explanation:
Answer:
Explanation:
Given
Initial velocity of ball ![u=10\ m/s](https://tex.z-dn.net/?f=u%3D10%5C%20m%2Fs)
height of window ![h=20\ m](https://tex.z-dn.net/?f=h%3D20%5C%20m)
Using Equation of motion
![y=ut+\frac{1}{2}at^2](https://tex.z-dn.net/?f=y%3Dut%2B%5Cfrac%7B1%7D%7B2%7Dat%5E2)
where u=initial velocity
t=time
a=acceleration
As ball is already is at a height of 20 m so
![Y=ut+\frac{1}{2}at^2+20](https://tex.z-dn.net/?f=Y%3Dut%2B%5Cfrac%7B1%7D%7B2%7Dat%5E2%2B20)
![Y=10\times t+0.5\times (-9.8)t^2+20](https://tex.z-dn.net/?f=Y%3D10%5Ctimes%20t%2B0.5%5Ctimes%20%28-9.8%29t%5E2%2B20)
![Y=-4.9t^2+10t+20](https://tex.z-dn.net/?f=Y%3D-4.9t%5E2%2B10t%2B20)
(b)highest point is obtained at v=0
![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
where
v=final velocity
u=initial velocity
a=acceleration
s=displacement
![(0)-10^2=2\times (-9.8)\times s](https://tex.z-dn.net/?f=%280%29-10%5E2%3D2%5Ctimes%20%28-9.8%29%5Ctimes%20s)
![s=\frac{100}{19.6}](https://tex.z-dn.net/?f=s%3D%5Cfrac%7B100%7D%7B19.6%7D)
![s=5.102\ m](https://tex.z-dn.net/?f=s%3D5.102%5C%20m)
Highest Point will be ![s+20=25.102\ m](https://tex.z-dn.net/?f=s%2B20%3D25.102%5C%20m)
(c)Time taken when the ball hit the ground i.e. at Y=0
![-4.9t^2+10t+20=0](https://tex.z-dn.net/?f=-4.9t%5E2%2B10t%2B20%3D0)
![t=3.28\ s](https://tex.z-dn.net/?f=t%3D3.28%5C%20s)
impact velocity ![v=\sqrt{2\times 9.8\times 25.102}](https://tex.z-dn.net/?f=v%3D%5Csqrt%7B2%5Ctimes%209.8%5Ctimes%2025.102%7D)
Answer: B 1/5, D .20
hope this helps let me know if it's wrong
Answer:
![\boxed{\sf 65.3 \ inches}](https://tex.z-dn.net/?f=%5Cboxed%7B%5Csf%2065.3%20%5C%20inches%7D)
Explanation:
1 foot = 12 inches
Sammy is 5 feet tall.
5 feet = ? inches
Multiply the feet value by 12 to find in inches.
5 × 12
= 60
Add 5.3 inches to 60 inches.
60 + 5.3
= 65.3