4.Jessica Diggins a US world champion cross country skier is participating in the winter Olympic games. Over a 200m stretch in her race she increases her speed with a constant acceleration from 5.1 m/s to 6.2 m/s over a period of 25 seconds. What is her acceleration

Explanation:

Given that,

Initial speed, u = 5.1 m/s

Final speed, v = 6.2 m/s

Time, t = 25 s

We need to find acceleration. We know that,

acceleration = rate of change of velocity

So, her acceleration is .

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

no

sodium is solid at rt