High School

A 95 kg fullback, running at 8.2 m/s, collides in midair with a 128 kg defensive tackle moving in the opposite direction. Both players end up with zero speed. What was the fullback's momentum before the collision?

a) 778.5 kg·m/s
b) 786.4 kg·m/s
c) 800.6 kg·m/s
d) 812.8 kg·m/s

Answer :

Final answer:

To calculate the fullback's momentum before the collision, multiply the mass (95kg) by the velocity (8.2 m/s), resulting in a momentum of 779 kgm/s. The closest provided answer choice is (a) 778.5 kgm/s.

Explanation:

The student asked what was the fullback's momentum before the collision. To find the momentum, we use the formula p = mv, where p is momentum, m is mass in kilograms, and v is velocity in meters per second. The fullback's mass is given as 95kg and the velocity is given as 8.2 m/s. Therefore, the momentum of the fullback before the collision is:

p = m imes v
p = 95kg imes 8.2 m/s
p = 779 kgm/s.

Thus, the closest answer to the calculated momentum is (a) 778.5 kgm/s, allowing for slight variations due to rounding.

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