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4-1.Newton's Laws of Motion
normal
A rocket which has a mass of $3.5 \times 10^4 \,kg$ is blasted upwards with an initial acceleration of $10\, m/s^2$. Then the initial thrust of the blast is-
A
$3.5 \times 10^5 \,N$
B
$7.0 \times 10^5 \,N$
C
$14.0 \times 10^5 \,N$
D
$1.75 \times 10^5 \,N$
Solution
Net upthrust $=$ Weight $+$ Blasted force
$U=m g+3.5 \times 10^{4} \times 10 \mathrm{ms}^{-2}$
$U=3 \cdot 5 \times 10^{4} \times 10 \mathrm{ms}^{-1}+3 \cdot 5 \times 10^{4} \times 10 \mathrm{ms}^{-2}$
$U=7 \cdot 0 \times 10^{5} \mathrm{N}$
Standard 11
Physics
