The mass of a two-person bobsled (without the people) is 300 kg. The bobsled starts from rest, and then the crew members push the sled with a constant force of 430 N on a flat, horizontal snowy surface for 25 meters before jumping aboard. The frictional force on the bobsled due to snow is 140 N, and air resistance on the bobsled is 20 N. a) How long of time does it take the crew members to push the bobsled 25 meters? b) The net external force on the bobsled while the crew members are pushing the bobsled is? c) What is the instantaneous speed of the bobsled after the crew members push it for 25 meters? d) The acceleration of the bobsled while the crew members are pushing the bobsled is?

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