Question

a car speeds up from 12 m/s to 20 m/s in 6.4 s. if its mass is 1200kg, what force must its engine provide?

Answer 1

1500 N

Step-by-step explanation:

• Initial velocity, u = 12 m/s

• Final velocity, v = 20 m/s

• Time taken, t = 6.4 s

• Mass, m = 1200 kg

`\longrightarrow` F = ma

a = (v – u)/t, so

`\longrightarrow` F = 1200 × (20 – 12)/6.4

`\longrightarrow` F = 1200 × 8/6.4

`\longrightarrow` F = 1200 × 80/64

`\longrightarrow` F = 1200 × 40/32

`\longrightarrow` F = 1200 × 20/16

`\longrightarrow` F = 300 × 20/4

`\longrightarrow` F = 300 × 5

`\longrightarrow` F = 1500 N (Answer)