A sledge of mass 80 kg moves over the frozen surface of a lake with a velocity of 30 m/s and comes to rest in 5 s. Find its negative acceleration and the frictional force between the lake and the sledge.
Answers
Answered by
15
Answer:
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Explanation:
u= 30 m/s
v =0
t = 5 sec
as, v = u + at
⇒0 = 30 + a×5
⇒5a = -30
⇒a = - 6 m/s²
retardation is 6 m/s²
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Answered by
4
Answer:
-2400 N kg per second
Explanation:
Force = mass * acceleration
F = 80kg *30
Here it is negative as it is frictional force and is applied against the moving body
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