First slide

Third law

Question

A rocket with a lift-off mass 3.5 x 10⁴ kg is blast upward with an initial acceleration of 10 $m s^{- 2}$ . Then, the initial thrust of the blast is [AIIMS 2012]

Moderate

A

1.75 x 10⁵ N
B

3.5 x 10⁵ N
C

7x10⁵ N
D

14x10⁵ N

Solution

Initial thrust must be
$m (g + a) = 3.5 \times 10^{4} (10 + 10) = 7 \times 10^{5} N$

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