Question

Best answer gets 100 points. What is the position at 8 seconds? Please help. Diagram and answers to part 1-3 are down below, need help with part 4, or, question 16. An explanation would be great :-)

Part 1: -4m/s

Part 2: -37.5m

Part 3: -29m/

Answer 1

#1

Velocity at 1s

• Initial velocity -3m/s

Acceleration -1m/s²

So final velocity=-3-1=-4m/s²

#2

Position at 1s

Displacement -4(1)=-4m

• Position=-34-4=-38m

#3

Velocity at 8s

• Initial at 2s =-3-2=-5m/s
• acceleration=-4m/s²
• Time=8-2=6s

Final velocity

• v=u+at
• v=-5-4(6)
• v=-5-24
• v=-29m/s

#4

Position

Displacement till 2s

• -4(2)=-8m

Displacement from 2 to 8s

• -29(6)
• -174m

Final position

• -34-8-174
• -38-174
• -212m