Answer:
475
Explanation:
Cori does not exert any more force than 475 J, so 475 is the answer.
It conserves both energy and momentum in the collision at the same time. By design, when the balls collide the strings that hold them up are vertical (assuming balls are only swung from one side).
: Hope this helps :)
Answer:
.
Explanation:
Let and denote the velocity of this hockey player before and after stopping, respectively. The question states that and implies that since the hockey player has come to a stop.
The duration of this acceleration is .
Since the acceleration of this hockey player was constant, SUVAT equation would apply. In particular, the SUVAT equation gives the displacement of this hockey player during that of acceleration:
.
In other words, this hockey player would have travelled while stopping.