A rocket with a lift-off mass 20000 kg is blasted upwards with an initial acceleration of 5 ms -2. the initial thrust of the blast is

Question

A rocket with a lift-off mass 20000 kg is blasted upwards with an initial acceleration of 5 ms -2. the initial thrust of the blast is (A) 1 × 105 N (B) 2 × 105 N (C) 3 × 105 N (D) 4 × 105 N

Tardigrade Admin · Accepted Answer

F-m g=m a ⇒ F=m(g+a)=(20000 kg )(10+5) ms -2 =3 × 105 N

Q. A rocket with a lift-off mass $20000 k g$ is blasted upwards with an initial acceleration of $5 m s^{- 2}$ . the initial thrust of the blast is

$1 \times 1 0^{5} N$

$2 \times 1 0^{5} N$

$3 \times 1 0^{5} N$

$4 \times 1 0^{5} N$

$F - m g = ma$
$\Rightarrow F = m (g + a) = (20000 k g) (10 + 5) m s^{- 2}$
$= 3 \times 1 0^{5} N$

Q. A rocket with a lift-off mass 20000kg is blasted upwards with an initial acceleration of 5ms−2. the initial thrust of the blast is

1×105N

2×105N

3×105N

4×105N