An object makes a uniform zero acceleration linear motion with an initial velocity of 2m / s and an acceleration of 1m / S ^ 2. Find 1. The velocity of the object at the end of 3S. 2. The object moves in the first 4S 2. The displacement of the object in the first four seconds 3. Average speed in 4S 4. The displacement of the object when the speed reaches 8m / s Ask 1.3 questions

An object makes a uniform zero acceleration linear motion with an initial velocity of 2m / s and an acceleration of 1m / S ^ 2. Find 1. The velocity of the object at the end of 3S. 2. The object moves in the first 4S 2. The displacement of the object in the first four seconds 3. Average speed in 4S 4. The displacement of the object when the speed reaches 8m / s Ask 1.3 questions

(1)v3=2+1*3=5
(2)s=2*4+1/2*1*4*4
=16
(3) 3 terminal velocity V3 = 2 + 1 * 3 = 5
v4 =2+1*4=6
So the average velocity in the fourth second is v '= (V3 + V4) / 2 = 11 / 2
(4) The time to reach 8m / S is t = (8-2) / 1 = 6S
s=2*6+1/2*1*6*6=30m