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. $T^{'} = 0$
• D. $T^{'} = 47.2N$

Answer 1

Answer: (C)

$T^{'} = 0$

Answer 2

Initial thrust on the rocket $F = m(g + a)$

$= 3.5 \times 10^{4}(10 + 10)$ $= 7.0 \times 10^{5}N$