2m
4m
6m
8m
Correct answer is B
\(v(t) = (3t^{2} - 2t) ms^{-1}\)
\(s(t) = \int v(t) \mathrm {d} t\)
= \(\int (3t^{2} - 2t) \mathrm {d} t = t^{3} - t^{2}\)
\(s(2) = 2^{3} - 2^{2} = 8 - 4 = 4m\)
100N
375N
500N
600N
Correct answer is A
\(F = ma = m(\frac{v - u}{t})\)
\(F = 25(\frac{35 - 15}{5}) = 25 \times 4 = 100N\)
\(5\sqrt{5}N\)
\(5\sqrt{7}N\)
\(7\sqrt{5}N\)
\(7\sqrt{7}N\)
Correct answer is B
No explanation has been provided for this answer.
4s
6s
8s
10s
Correct answer is C
F = ma
\(200 = 20a \implies a = 10m/s^{2}\)
\(s = ut + \frac{1}{2}at^{2}\)
\(320 = (0 \times t) + \frac{1}{2} 10t^{2}\)
\(320 = 5t^{2} \implies t^{2} = 64\)
\(t = 8secs\)
\(\frac{1}{3}\)
\(\frac{1}{2}\)
\(\frac{3}{4}\)
1
Correct answer is D
P(white or red) = P(white) + P(red)
= \(\frac{3}{4} + \frac{1}{4}\)
= 1