26. We choose +yupward, which implies a> 0 (the acceleration is upward since it represents a deceleration of his downward motion through the snow). (a) The maximum deceleration amaxof the paratrooper (of mass mand initial speed v= 56 m/s) is found from Newton’s second law Fmgmasnowmax−=where we require Fsnow= 1.2 ×105N. Using Eq. 2-15 v2= 2amaxd, we find the minimum depth of snow for the man to survive: ()2225maxsnow85kg 56m s1.1 m.2 1.2 10 NvmvdaFmg==≈=−×(b) His short trip through the snow involves a change in momentum
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.