Question

question 1)The speed of a car weighing 1500 kg increases from 36 km/h to 72 km/h uniformly. What will be the change in momentum of the car? *

(a) 15000 kg km/h
(b) 15000 kg m/s
(c) 54000 kg m/s
(d) 54000 g m/s

question 2)Newton’s first law of motion says that a moving body should continue to move forever , unless some external forces act on it. But a moving cycle comes to rest after some time if we stop pedaling it. Can you choose the correct reason for the stoppage of cycle? i. Air resistanceii. Gravitational pull of the earth ii. Friction of the road iii. Heat of the environment Choose the correct option: *

(a) (iii) and (iv)
(b) (i) and (iii)
(c) (i) and (ii)
(d) (ii) and (iii)​

Answer 1

1st c) 54000kg m/s

2nd c) (i) and (iii)

Explanation:

Momentum= mv

where m is mass and v is velocity

So change in momentum =

2nd Momentum - 1st Momentum

108000-54000

54000 kgm/s