A car is moving at 36m/s when the brakes are suddenly applied. The car slows down to 15m/s in 6.4s. How fast is it moving 3.8s after brakes are applied, assuming constant acceleration?

Hailstones with an average mass of 4g fall vertically and strike a flat roof at 12 metres per second.In a period of 5 minutes 6000 hailstones fall on each square metre of roof and rebound vertically at 3 metres per second. Calculate the force on the roof if it has an area of 30 square metres.

The electric potential at the origin of an xy-coordinate system is 40 V. A -8.0-μC charge is brought from x = +∞ to that point. What is the electric potential energy of this charge at the origin? Answer A) 8.0 μJ B) 40 μJ C) -3.2 × 10-4 J D) -40 μJ

Sue and Jenny kick a soccer ball at exactly the same time. Sue's foot exerts a force of 41.4 N to the north. Jenny's foot exerts a force of 102.7 N to the east. a) What is the magnitude of the resultant force on the ball? b) What is the direction of the resultant force (measured from East)?