Question

A rocket with a lift- off mass $3.5 \times 10 ^ { 4 }$ is blasted upwards with an initial acceleration of Then the initial thrust of the blast is

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

Answer 1

Answer: (C)

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

Answer 2

Initial thrust must be

$m [ g + a ] = 3.5 \times 10 ^ { 4 } ( 10 + 10 ) = 7 \times 10 ^ { 5 } \mathrm {~N}$