Question

3.An object travels 40m in 5 sec and then another 80m in 5 sec. What is the average speed of the object?

(1 Point)

(a) 12 m/s

(b) 6 m/s

(c) 2 m/s

(d) 0 m/s

4.The acceleration of a body from a velocity –time graph is

(1 Point)

(a) Is denoted by a line parallel to the time axis at any point on the distance axis

(b) Equal to the slope of the graph

(c) Area under the graph

(d) Is denoted by a line parallel to the distance axis at any point on the time axis

5.An example of a body moving with constant speed but still accelerating is

(1 Point)

(a) A body moving with constant speed on a straight road

(b) A body moving in a helical path with constant speed

(c) A body moving with constant speed in a circular path

(d) A body moving with constant speed on a straight railway track

6.A car is travelling at a speed of 90 km/h. Brakes are applied so as to produce a uniform acceleration of – 0.5 m/s². Find how far the car will go before it is brought to rest?

(1 Point)

(a) 8100 m

(b) 900 m

(c) 625 m

(d) 620 m

7.The rate of change of momentum of an object is proportional to

(1 Point)

a) Mass of the body

(b) Velocity of the body

(c) Net force applied on the body

(d) None of these

8.Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the frictional force that will be exerted on the cabinet?

(1 Point)

(a) 2 N

(b) 20 N

(c) 200 N

(d) 2000 N​

Answer 1

Answer:

1) total distance/total time

120/10

12m/s

2) c

3) c

4) u=90km/hr = 25m/s

acc=-0.5

v=0

v²-u²=2as

0²-25²=2×-5×s

-25×25/-10=s

625/10=s

62.5 =s

8)200n