Answers

2014-12-20T20:00:22+05:30
Here d= 250m
t= 10 seconds
initial velocity(u)= 0
using equation d= ut +1/2 at2, we will get
250 = 50 xa
a=5m/s2
force= mass x acceleration = 0.9ks x 5m/s2 = 4.5 newton
therefore answer is (a) 4.5 newton
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2014-12-21T00:03:33+05:30

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S = u t + 1/2 a t²
250 = 0 + 1/2 * a * 10²

a  = 5 m/sec²

force = mass * acceleration = 0.9 kg * 5 m/sec² = 4.5 Newtons


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