Question

224 AWARENESS SCIENCE FOR SEVENTH CLASS
35. A train having a speed of 75 km/h takes 6 hours to travel from Delhi to Amritsar. Calculate the distan
between Delhi and Amritsar.
36. A car is running at a speed of 60 km/h. How much time will it take to cover a distance of 270 km?
37. An ant covers 1 metre distance in 10 seconds. What is the speed of the ant in cm/s?
38. A train is running at a speed of 120 kilometres per hour. Calculate the distance travelled by the trair
one minute.
39. A car travelling at a speed of 45 km/h takes 20 minutes to reach its destination. What distance has the
travelled ?
40. The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate
speed of the train.
41. In an experiment to measure the speed of a moving ball, it is observed that the ball covers a distanc
5 m and 20 cm in 4 seconds before it comes to a stop. Calculate the speed of the ball in m/s.
42. A train is running at a speed of 60 km/h. Calculate the speed of train in m/s.
43. The speed of a racing car is 60 m/s. What will this speed be in km/h?
44. In a distance-time graph:
(a) What type of motion does a straight line represent ?
(h) What tune of motion​

Answer 1

35)

Speed = 75km/h

Time = 6h

Distance = Speed × Time

= 75×6

= 450 km

36)

time=distance/speed  

=270/60

4.5 hours

37)

Distance = 1 m = 100 cm

Time = 10 s

Speed = distance/time = 100/10 = 10 cm/s

38)

speed= 120km/h

So, in 1 min = 120×1000/60

= 2000metre per min

39)

Given:-

speed = 45km

time = 20min = 20/60 hour

distance = speed × time

= 45×20/60

= 45/3

= 15 km.

40)

T = 4h

D = 240km

S = ?

S*T = D

S = D/T

S = 240/4

S = 60 km/h

41)

distance =5m and 4cm =5.20

time = 4 sec

speed = distance ÷time

speed =5.20 ÷ 4

speed = 1.3 meter per second

42)

speed of train = 60 km/h

speed of train in m/s

60*1000/60*60

=1000/60

=16.66666m/s

43)

Speed of the racing car=60m/s

1m =1/1000 km

1s 1/3600 h

Speed of car in km /h =(60×3600)÷1000

=216km/h

44)

(a.) Uniform motion

(b.) Non-uniform motion

Answer 2

Step-by-step explanation:

go awat hahahaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa