A skateboarder with a mass of 45 kilograms is riding on a skateboard with a mass of 2.5 kilograms. What should be the velocity of the skateboarder if she has to attain a momentum of 264 kilogram meters/second?
A. 5.5 meters/second
B. 55.5 meters/second
C. 1.2 × 102 meters/second
D. 1.2 × 103 meters/second
E. 1.2 × 104 meters/second

Question

A skateboarder with a mass of 45 kilograms is riding on a skateboard with a mass of 2.5 kilograms. What should be the velocity of the skateboarder if she has to attain a momentum of 264 kilogram meters/second?
A. 5.5 meters/second
B. 55.5 meters/second
C. 1.2 × 102 meters/second
D. 1.2 × 103 meters/second
E. 1.2 × 104 meters/second

anonymous · Answer

5. 5 meter/sec 
Total mass= 45 + 2.5= 47.5 kg
Total momentum = 264
momentum= mass x velocity.
ie 264= 47.5 x velocity 
velocity = 264/47.5 = 5.5 m/sec