Answer:
PE = (|accepted value – experimental value| \ accepted value) x 100%
Explanation:
Answer:
– 2.5 m/s²
Explanation:
We have,
• Initial velocity, u = 180 km/h = 50 m/s
• Final velocity, v = 0 m/s (it stops)
• Time taken, t = 20 seconds
We have to find acceleration, a.
a = (v ― u)/t
a = (0 – 50)/20 m/s²
a = –50/20 m/s²
a = – 5/2 m/s²
a = – 2.5 m/s² (Velocity is decreasing) [Answer]
Answer:
The direction of the contact forces acting on a body is not necessarily perpendicular to the contact surface. The resolution of contact forces in two components i.e. perpendicular to contact surface and along surface. Perpendicular component is normal force and parallel component is friction.
Explanation:
Answer:Expression given below
Explanation:
Given mass of spring![\left ( m_1\right )=0.5 kg](https://tex.z-dn.net/?f=%5Cleft%20%28%20m_1%5Cright%20%29%3D0.5%20kg)
Compression in the spring![\left ( x\right )=20 cm](https://tex.z-dn.net/?f=%5Cleft%20%28%20x%5Cright%20%29%3D20%20cm)
Let the spring constant be K
Using Energy conservation
potential energy stored in spring =Kinetic energy of Block![\left ( m_1\right )](https://tex.z-dn.net/?f=%5Cleft%20%28%20m_1%5Cright%20%29)
![\frac{1}{2}Kx^2=\frac{1}{2}m_1v^2](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7DKx%5E2%3D%5Cfrac%7B1%7D%7B2%7Dm_1v%5E2)
![v=x\sqrt{\frac{k}{m_1}}](https://tex.z-dn.net/?f=v%3Dx%5Csqrt%7B%5Cfrac%7Bk%7D%7Bm_1%7D%7D)
now conserving momentum
![m_1v=\left ( m_1+m_2\right )v_0](https://tex.z-dn.net/?f=m_1v%3D%5Cleft%20%28%20m_1%2Bm_2%5Cright%20%29v_0)
![v_0=\frac{m_1}{m_1+m_2}v](https://tex.z-dn.net/?f=v_0%3D%5Cfrac%7Bm_1%7D%7Bm_1%2Bm_2%7Dv)
where
is the final velocity