The Total solution for NCERT class 6-12
A rocket with a lift-off mass 20,000 kg isblasted upwards with an initial acceleration of 5.0 m s–2. Calculatethe initial thrust (force) of the blast.
Mass of the rocket, m =20,000 kg
Initial acceleration, a = 5m/s2
Acceleration due to gravity, g =10 m/s2
UsingNewton’s second law of motion, the net force (thrust) acting on the rocket isgiven by the relation:
F – mg = ma
F = m (g + a)
=20000 × (10 + 5)
=20000 × 15 = 3 × 105 N