It is given that the friction is negligible which employs acceleration is zero.
v^2 = u^2 + 2*a*s
v^2 = 50^2 + 2*0*400
V = 50 m/s
Hence, initial speed = final speed = 50 m/s
a hockey puck is whqcked across the surface if a level frozen lame tjat is 400...
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