An 84.0 kg sprinter starts a race with an acceleration of 1.44 m/s2
1. An 84.0 kg sprinter starts a race with an acceleration of 1.44 m/s2. If the sprinter accelerates at that rate for 41 m, and then maintains that velocity for the remainder of the 100 m dash, what will be his time (in s) for the race?
2.
(a) If the rocket sled shown in the figure below starts with only one rocket burning, what is the magnitude of its acceleration (in m/s2)? Assume that the mass of the system is 2090 kg, the thrust T is 1.1 x 104N, and the force of friction opposing the motion is known to be 720 N.
(b) Why is the acceleration not one fourth of what it is with all rockets burning? (The acceleration when all four rockets are burni 21 m/s2. The force of friction remains 720 N.)
Homework Answers
First question is solved using kinematics equation. Second using F=m×a equation.
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