Question

. A car of mass 300 kg is moving with a velocity of 15 m/s. If the velocity-time graph for this car is a horizontal line parallel to the time axis, then the velocity of the car at the end of 20 s will be​

Answer 1

Answer:

15 m/s. Because it's velocity has not changed when line is parallel to time axis.

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Answer 2

Answer:

Mass of the car =2400 kg

Initial velocity u=20 m/s

Final velocity v=0 m/s

Time t=10s

Retardation a=

t

v−u

=

10

0−20

=−2m/s

2

Force =m×a=2400×2=−4800N.