Question

Please answer 6 and 7 questions

Answer 1

6.) because man and elevator both falls freely with same acceleration g, therefore the force exerted by the floor on the man is zero.
hence the correct answer is (c).


7.)
$mass = 120kg \\ velocity = 108km {hr}^{ - 1} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 108 \times \frac{5}{18} = 30m {s}^{ - 1}$
$momentum (p) = m \times v \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 120 \times 30 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 3600$
$force = \frac{p}{t}$
$force = \frac{3600}{10} \\ = 360n$
hence,the correct answer is (A).