The rocket flew 28 km in 4 s, then its speed increased by 3 km / s. Find the rocket speed at the end of the fifth second.

In order to solve this task and find what speed the cancer had at 5 seconds, you first need to find the speed of the rocket at 4 seconds. To do this, you need to find the partial numbers 28 and 4. Let’s make an example:

28: 4 = 7 km / s;

Let’s find the speed of the rocket at 5 seconds of flight:

7 + 3 = 10 km / s.

Answer: at 5 seconds of flight, the rocket speed reached 10 km / s.