Question

Physics Assignment
Class Vll
Q1. A bus travels a distance of 50km in 45 min. Calculate its speed in m/s.
Q2. Calculate the density of ice in g/cm cube when 230 Kg of ice occupies 0.25 m cube volume.
Q3.A truck is moving with a speed of 90 km/hr. Calculate the distance covered by it in 5 hours.
Q4.A rectangular field is of length 80 m and breadth 45 m
Find the area of the field.
Q5.Express 18 Km/hr in m/s.
Express 12 Km/ min in m/s​

Answer 1

Answer:

Q1. speed= d/t

50000m/2700s ( 1km=1000m

thus, 50km=50000m)

1mint =60sec

thus, 45mints= 45×60=2700s)

= 18.51 m/s

Q3. speed=d/t

• 90km/h= d/5hours ( units are in same form so, we wouldn't convert in m/s.)
• d=90/5
• d=18km.

Q4. l=80m

b =45m

area of rectangle= l×b

thus,80×45

=3600m²

Q5. 18000/60×60 (1km= 1000m, 18km=18×1000m)

hr=60mints

1mint=60sec

60mints = 60×60

=5m/s

• 12000/60 (1km=1000m, 12×1000m)
• (1mint=60sec)

200m/s