Question

A car covers 90 km in 60 min, and a truck covers 54 km in the same period of time. The linear momentum of the truck is $15\times {10}^{3}kgm/s$. The mass of the car is 500 kg.

The mass of the truck is:

[1 mark]

• A. 800 kg
  
• B. 1,000 kg
  
• C. 700 kg
  
• D. 900 kg
  

Answer 1

The correct option is B 1,000 kg


Given,
Speed of the truck = 54 km/hr = 15 m/s
Linear momentum of the truck (p)
p = 15,000 kg m/s

Linear momentum, p = mv
$\Rightarrow$15,000 = m $\times$ 15
$\Rightarrow$m = 1,000 kg