Question

A car weighs 1000 kgf changes its velocity from 36 km/h to 108 km/h in 4 seconds.
Based on this data answer the following questions;-[4]
A)Calculate change in momentum?
1.200000 kgm/s
2.2000 kgm/s
3.20000 kgm/s
4.72000 kgm/s
B)What is the magnitude of change in kinetic energy?
1.4 x 105 J
2.72000 J
3.4 x 104 J
4.4 x 106 J
C)What is the amount of work done?
1.400 kJ
2.72 kJ
3.4000 kJ
4.40 kJ
D)Calculate the power developed in the engine of the car?
1.4x105 W
2.4x104 W
3.10 kW
4.100 kW​

Answer 1

Answer:

1. 20000

Step-by-step explanation:

mass = 1000 KG

u or initial velocity = 36 km/h which is

$36 \times \frac{5}{18}$

Which equals 10 m/s

v or final velocity = 108 km/h which

$108 \times \frac{5}{18}$

Which equals 30 m/s

then change momentum = final momentum - initial momentum

p1 momentum1 = mass × u

p1 = 1000 x 10

p1 = 10000

p2 = mass × v

p2 = 1000 x 30

p2 = 30000

Change in momentum = 30000 - 10000

change in momentum = 20000 kg. m/s

Option 3 is correct for first question

as I am 9th I don't know all question

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