1. You throw a 50kg ball upwards at 25m/s. The ball strikes the beginning of the...

1.

You throw a 50kg ball upwards at 25m/s. The ball strikes the beginning of the spring when it's 8 meters in the air, then it begins to compress the spring. How far did the spring compress? The spring constant is 300 Newton/meter.

Also, if the spring was not there, how far would have it gone up (set the final velocity to zero)?

2.

You see a teeter-todder again. It's horizontal (balanced). A 100kg person sits 4 meters to the right, and a 30kg person sits 8 meters to the left (of the pivot). On what side, and where, must a 69kg person sit for it to balance? And what force must the ground push up on the tetter-todder, in order for it to not fall down (find the ground's normal force)?

Expert Solution

genius_generous answered 1 year ago

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