Please show detailed work. thank you. t Tools Table Window Help Practice Problem

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Please show detailed work. thank you.

t Tools Table Window Help Practice Problems (1) ferences Mailings Review View No Soacing ng Heading 2 PHYS 101-06 Practice Problems 1. You can run 9.0 m/s, 20% faster than your brother. How much head start should you give him in order to have a tie race over 100 m? 2. A hockey puck moving at 32 m/s slams through a wall of snow 35 cm thick. It emerges moving at 18 m/s. Assuming constant acceleration, find (a) the time the puck spends in the snow and (b) the thickness of a snow wall that would stop the puck entirely 3 8

Explanation / Answer

1.

Vi = speed of me = 9 m/sec

Vb = speed of brother = Vi/120%

Vb = 9/1.2 = 7.5 m/sec

distance traveled = 100 m

time taken by me = ti = 100/9 = 11.11 m/sec

time taken by my brother , tb = 100/7.5 = 13.33 m/sec

Extra time given to brother = 13.33 - 11.11 = 2.22 sec

So brother should start 2.22 sec before me,

then distance traveled by brother in that time will be head start

Head start = 7.5*2.22 = 16.65 m

Brother should be given a head start of 16.65 m

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