Question

3 A ball of mass 10 g is initially moving with
a velocity of 50 m sl. On applying a constant
force on ball for 2.0 s, it acquires a velocity of
70 ms-1. Calculate:
(i) the initial momentum of ball
(ii) the final momentum of ball​

Answer 1

Explanation:

momentum (p) = mass (m) × velocity (v)

1. Initial momentum

p1 = m × v1

initial mass = 10 g = 0.01 kg

initial velocity = 50 m/s

p1 = 0.01 × 50

p1 = 0.5 kgm/s

2. Final momentum

p2 = m × v2

final mass = 0.01 kg

final velocity = 70 m/s

p2 = 0.01 × 70

p2 = 0.7 kgm/s

Answer 2

Explanation:

Mass=10g=10/100 =10-2 kg

initial velocity ,u =50ms-1

initial momentum =mass × initial velocity

=10-2×50

=0.5kgms-1