A car travels at a constant speed of 15 m/s for 2 minutes. The car increases its speed from 15 to 25 mls during the next minute and then travels at a constant speed of 25 m/s
for 2 more minutes. Which of the following graphs best represents the car's motion
during this 5-minute period?

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

i think the answer is a, hope this : )

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.