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. $1.75\times {10}^{5}N$
• B. $3.5\times {10}^{5}N$
• C. $7.0\times {10}^{5}N$
• D. $14.0\times {10}^{5}N$

Answer 1

The correct option is C

$7.0\times {10}^{5}N$

Initial thrust on the rocket $F=m(g+a)=3.5\times {10}^4(10+10)=7.0\times {10}^{5}N$