A shop has an offer on jumpers as shown below.
Buy 3 jumpers and get 1 free!
Kara gets 5 jumpers.
After applying the offer, each one ends up costing £4.80 per jumper.
What is the regular cost of one jumper when not in this offer?
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Step-by-step explanation:
M = 1kg
u = 20m/s. v = 0m/s.
s(distance travelled) = 50m
using third equation of motion
v²=u²+2as
0² = (20)²+2(a)(50)
-400 = 100a
a = -400/100 = -4m/s² (retardation)
F = m×a
F = 1×(-4) = -4N. (negative sign indicates the opposing force which is Friction)
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