The acceleration of an object a = 0.5m/s when it moves in a straight line with uniform acceleration at initial velocity V0 = 5m / s 1. Find the speed at the beginning of the fifth second 2. Average speed in the first three seconds

The acceleration of an object a = 0.5m/s when it moves in a straight line with uniform acceleration at initial velocity V0 = 5m / s 1. Find the speed at the beginning of the fifth second 2. Average speed in the first three seconds

The velocity at the beginning of the fifth second is equal to the velocity at the end of the fourth second, that is, 5 + 0.5 × 4 = 7m / s
The average speed of the first three seconds is equal to the total bit removal of the first three seconds by 3, i.e. (5 × 3 + 0.5 × 3 × 3 △ 2) △ 3 = 5 + 0.75 = 5.75m/s