Question

A truck of mass 15 tons moving with $1m{s}^{-1}$ collides with a stationary truck of mass 10 tons and automatically connected to move together. total K.E before collision is

• A. 4500 J
• B. 7500 J
• C. 3000 J
• D. 0 J

Answer 1

The correct option is B 7500 J

K.E before collision $=\frac{1}{2}\times 15\times (1{)}^2\times {10}^3$
$=7500$ J