Question

a 30 tonne lorry changed velocity from 5m/s to 15m/s in 30 seconds (1 tonne = 1000 kg) . calculate the force accelerating the lorry

Answer 1

Force 9 900 N

Step-by-step explanation:

Given:

m = 30 tonne = 30 000 kg

V₀ = 5 m/s

V = 15 m/s

Δt = 30 s

___________

F - ?

Acceleration:

a = ΔV / Δt = (V - V₀) / Δt

a = (15 - 5) / 30 ≈ 0.33 m/s

Force:

F = m·a = 30 000·0.33 = 9 900 N