One strategy in a snowball fight is to throw a snowball at a highangle over leve

Question

One strategy in a snowball fight is to throw a snowball at a highangle over level ground. While your opponent is watching thatsnowball, you throw a second one at a low angle timed to arrivebefore or at the same time as the first one. Assume that bothsnowballs are thrown with a speed of 30.0 m/s. The first one is thrown at an angle of70.0°with respect to the horizontal. (a) At what angle should the second snowball bethrown to arrive at the same point as the first?
1
Your response differs from the correct answerby 10% to 100%.°

(b) How many seconds later should the second snowball be thrownafter the first in order for both to arrive at the same time?
2
Your response differs from the correct answerby 10% to 100%. s (a) At what angle should the second snowball bethrown to arrive at the same point as the first?
1
Your response differs from the correct answerby 10% to 100%.°

(b) How many seconds later should the second snowball be thrownafter the first in order for both to arrive at the same time?
2
Your response differs from the correct answerby 10% to 100%. s

Explanation / Answer

First, the angle that it should be thrown at will be 20degrees.  70 and 20 are complimentary angles and theirsin and cos components will switch. For the second, you can find out how long the first snowballwill be in the air vy = voy +gt where voy= sin 70 * 30m/s = 28.19m/s t = -28.19 -28.19/9.8m/s2 = 5.75s For the second voy = sin 20 * 30m/s = 10.26 t = -10.26 - 10.26/9.8m/s2 = 2.094s 5.75s - 2.094s = 3.66s later Hope that helps First, the angle that it should be thrown at will be 20degrees.  70 and 20 are complimentary angles and theirsin and cos components will switch. For the second, you can find out how long the first snowballwill be in the air vy = voy +gt where voy= sin 70 * 30m/s = 28.19m/s t = -28.19 -28.19/9.8m/s2 = 5.75s For the second voy = sin 20 * 30m/s = 10.26 t = -10.26 - 10.26/9.8m/s2 = 2.094s 5.75s - 2.094s = 3.66s later Hope that helps

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