Questions

The interval between object pass the same point is 4 sec.

That means in 2 sec, object reaches the top and in next 2 sec, it again reaches the same point.

By the info given, we can find the velocity of that point by using : v=u+(-gt)

0= u - 10×2

u = 20

Then the velocity at 25m is 20m/sec.

so the initial velocity is

$$\begin{gathered} -v2 = u2 + (-2gh) \\ 400 = u2 - 2x 10 x 25 \\ u2 = 900 \\ => u = 30 m/s \end{gathered}$$

In vulcanization, cruder rubber is heated with 3% sulphur at about for 1200C for 2-3 hours.

Vulcanised rubber is a vastly improved product.

Like many other profession, customer service jobs have work ethics and rules that must be obeyed. With this, stick to the complaint procedure. Tell them we don’t need to rush things and submit complaints to highest official. Instead, approach the team leader first, the administrator and so on.

River Dolphin is the National Aquatic Animal of India.