How long will it take to move the mass through 20m, if a 5 N force acts on a 2.5 kg mass at rest, making it accelerate in a straight line, What will be its velocity after 3 seconds.
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Answer:
(l) 4.5s approx.
(ll) 6m/s
Explanation:
(I) u = 0
S = 20m
F = 5N
m = 2.5kg
F = ma
5 = 2.5a
a = 5/2.5 = 2m/s^2
S = ut + 1/2 at^2
20 = 0×t + 1/2 ×2× t×t
20 = t^2
t = √20 s = 4.5 s approx.
(ll) t = 3 s
u = 0m/s
v= u + at
v = 0+2×3
v = 6m/s
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