Suppose Larissa throws a ball up in the air and it comes back down to the same p

Question

Suppose Larissa throws a ball up in the air and it comes back down to the same place she threw it from. Ignoring times when the ball is in contact with her hand, and ignoring air resistance (friction with the air), identify the point(s) of

a.

Maximum and minimum potential energy.

b.

Maximum and minimum kinetic energy.

c.

Maximum and minimum total mechanical energy.

d.

Please briefly describe the energy transformation taking place as the ball rises in the air, and also when it is falling back to earth.

a.

Maximum and minimum potential energy.

b.

Maximum and minimum kinetic energy.

c.

Maximum and minimum total mechanical energy.

d.

Please briefly describe the energy transformation taking place as the ball rises in the air, and also when it is falling back to earth.

Explanation / Answer

a. maximun P.E at heighest point .

minimum p.E. at lowest point (when it is in hands)

b. max. k.e. = just after it leaves his hand and just before it comes inhis hand ( at lowest point)

min k.e. = at highest point ( its 0 here)

c. total mechanical energy is always same.

d. total mechanical energy is always same.

total M.E. = P.E + K.E. = constant.

if P.E.increases K,E. decreases. when P.E. is min. , K.E. is Max. and vice versa

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