Question

. A car covers half parts of it’s displacement during straight line journey with 40 km/hr and second half with

60 km/hr, find it’s average velocity.​

Answer 1

Answer:

11th

Physics

Motion in a Straight Line

Speed and Velocity

A car covers the first half...

PHYSICS

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Asked on January 17, 2020 by

Tiyasha Kosambia

A car covers the first half the distance between two places at 40 km/h another half at 60 km/h, the average speed of car

MEDIUM

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ANSWER

Letx consider, x= total distance covered by the car,

Time taken to complete the half distance with velocity v=40km/h,

t

1

=

2×40

x

=

80

x

hr. . . . .(1)

The time taken to complete another half distance with velocity u=60km/h

t

2

=

2×60

x

=

120

x

hr

The total time taken, t=t

1

+t

2

t=

80

x

+

120

x

=

48

x

hr

The average speed of the car,

v

avg

=

x/48

x

=48km/h