# physics

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EXERCISE 4.9 (a) Suppose a hockey puck slides down a frictionless ramp with an acceleration of 5.00 m/s2. What angle
does the ramp make with respect to the horizontal? (b) If the ramp has a length of 6.00 m, how long does it take the
puck to reach the bottom? (c) Now suppose the mass of the puck is doubled. What’s the puck’s new acceleration down the
ramp?

• physics -

(a) ma=mgsinα
sinα=a/g=5/9.8 =0.51
α=30.7°
(b) s=at²/2
t=sqrt(2s/a)=...
(c) the same acceleration

• physics -

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