Question

A rocket with a lift-off mass $3.5\times {10}^{4}kg$ is blasted upwards with an initial acceleration of $10m{s}^{-2}$. 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. $1.75\times {10}^{5}N$

Answer 1

The correct option is A $3.5\times {10}^{5}N$

According to the second law of Newton-

$F=ma$

$F$; Force or thrust

$m$; the mass of the object

$a$; acceleration of the object

$\Rightarrow F=(3.5\times {10}^4)\times 10$

$\Rightarrow F=3.5\times {10}^{5}N$