A hockey player is standing on his skates on a frozen pond when anopposing playe

Question

A hockey player is standing on his skates on a frozen pond when anopposing player, moving with a uniform speed of 13 m/s, skates by with the puck. After 2.5 s, the first player makes up his mind to chase hisopponent. If he accelerates uniformly at 5.0 m/s2, determine each of the following. (a) How long does it take him to catch hisopponent? (Assume the player with the puck remains in motion atconstant speed.)
1 s
(b) How far has he traveled in that time?
2 m
(a) How long does it take him to catch hisopponent? (Assume the player with the puck remains in motion atconstant speed.)
1 s
(b) How far has he traveled in that time?
2 m

Explanation / Answer

p1 13m/s constant p2 5 m/s2 distance after 2.5s > 13*2.5=32.5m distance for p1 = p2 32.5+13t=1/2 (5)t2 0=2.5t2-13t-32.5 t= 7.0 s and -1.8 s a) 7s b)d=1/2*( 5 )72 d=122.5m

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