Motion and Newton's laws

A car starts from rest and reaches 20 m/s in 5 s with uniform acceleration. What is its acceleration?

• 1 2 m/s2
• 2 4 m/s2
• 3 5 m/s2
• 4 100 m/s2

A car starts from rest and reaches 20 m/s in 5 s with uniform acceleration. How far does it travel in those 5 s?

• 1 50 m
• 2 100 m
• 3 20 m
• 4 25 m

What force gives a 2 kg mass an acceleration of 3 m/s2?

• 1 1.5 N
• 2 5 N
• 3 6 N
• 4 9 N

The SI unit of momentum is:

• 1 kg m/s
• 2 kg m/s2
• 3 N s2
• 4 kg m2/s

For a projectile fired from level ground, the range is greatest when the angle of projection is:

• 1 30 degrees
• 2 45 degrees
• 3 60 degrees
• 4 90 degrees

A stone is dropped from rest. Taking g = 10 m/s2 and ignoring air resistance, what is its speed after 3 s?

• 1 10 m/s
• 2 15 m/s
• 3 30 m/s
• 4 45 m/s

A 1000 kg car moving at 10 m/s is brought to rest in 5 s. What is the average braking force?

• 1 500 N
• 2 1000 N
• 3 2000 N
• 4 10000 N

Newton's third law says that when body A exerts a force on body B:

• 1 B exerts no force on A
• 2 B exerts an equal and opposite force on A
• 3 B exerts a smaller force on A
• 4 B exerts a force on A in the same direction