Question

Each Oliviain
6. A cricket player catches a ball of mass 0.1 kg
moving with a speed of 10 m/s in 0.1 s. Force
exerted by him is
(a) 10 N (b) 5 N (c)2N (d) 1 N
7. What force will change the velocity of a body of
mass 1 kg from 20 m/s to 30 m/s in 2 s?
(a) 25 N
(b) 5 N
(c) 10 N
(d) 2 N
8. A body of mass 2 kg is moving with a velocity of
8 m/s on a smooth surface. If it is to be brought to
rest in 4 s, then force to be applied is
(a) 8 N
(b) 4N​

Answer 1

Answer:6)a 7)b 8)b

Explanation:6)initial velocity I.e. u of the ball is 0m/s and v i.e. final velocity is 10 m/s

Therefore acceleration is v-u÷t

i.e. 10-0÷0.1 which is equal to 100m/s^2

Then F=ma

=0.1 ×100

=10N

7)Here u=20m/s and v=30 m/s

Therefore a= v-u÷t

=30-20÷2

=5m/s^2

Therefore F= ma= 1×5=5N

8)Here again u=0m/s and v=8m/s

Therefore a=2m/s^

Force=ma=2×2=4N