Question

Answer question no 7

Answer 1

Answer:

500 N

Explanation

acceleration = 20/4 = 5m/s2

so ,

force = m× a

= 100 g × 5

= 500N

Answer 2

According to Newton's Second Law,

$F = \frac{dp}{dt}$

$dp = F \times dt$

$dp = 1000 \times 0.01 = 10kgms {}^{ - 1}$

$∴ Change \: in \: momentum = 10kgm s {}^{ - 1}$