Question

A one tonne crane increases its speed from 30km/h to 108km/h in 35 seconds. Calculate the change in momentum

Answer 1

21.67kgms-1

Step-by-step explanation:

30kmh-1 = ( 30× 1000) ÷ 3600 = 8.33 ms-1

108 Kmh-1 = (108 × 1000) ÷ 3600 = 30ms-1

change in momentum = ∆mv

= 1000000 kg ( 30 -8.33) ms-1

= 21.67 ×10^6 kgms-1