Question

Convert the following into metre per seconds:
1)36 km per hour.
2)72 km per hour.
3)108km per hour.
4)54km per hour.
5) Printer run 100 metre distance in 10 seconds. Find if speed in metre per seconds and km per hour.
6) A car runs 90 km in 5 hours. Find its speed in km per hour and metre per seconds.
7) Velocity of a vehicle increases from 5 metre per seconds to 15 metre per seconds in 5 seconds. Finding its acceleration.
8) Velcocity of car moving with 72 km per hour reduces to 18 km per hour in 10 seconds. Find its acceleration.
9)A car moving with velocity of 56 km per hour come to rest in 20 seconds. Find its acceleration. ​

Answer 1

Answer:

Answer

average speed = total distance / total time

=

t

1

+t

2

s

1

+s

2

=

36

x

+

54

x

x+x

=

x(

36

1

+

54

1

)

2x

=

(

108

5

)

2

=

5

216

=43.2km/h

Explanation:

72 km/h

1 km=1000 m

and 1 h=3600 sec

h

1 km

=

3600

1000

=

18

5

m/s

∴72 km/h=

18

5

×72 m/sec

=20 m/sec