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savannahseegars savannahseegars
  • 10-02-2017
  • Physics
Answered

a 22 kg sled is pushed for 5.2 m with a horizontal force of 20 N, starting from rest. ignore friction. find the final speed of the sled.

2.2 m/s

4.7 m/s

9.5 m/s

3.1 m/s

Verified Answer :

scme1702
scme1702 scme1702
  • 18-02-2017

We first calculate the friction on the sled using:
F = ma
a = 20 / 22
a = 0.91 m/s²

Now we use the formula:
2as = v² - u²
v = √(2as + u²)
v = √[2(0.91)(5.2) + 0]
v = 3.08 m/s

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