At 2.00 pm a car's speedometer reads 30 miles/hr. At 2.10 it reads 50 miles/hr . Show that sometime between 2.00 and 2.10 the acceleration is exactly 120 miles/hr^2.

A car increases its speed from 20 km/h to 50 km/hr in 10 seconds. Its acceleration is _________.

An aircraft is going at a speed of Mach 2 . It speed is nearly _____ km/hr

A man at a speed of 6 km/hr for 1 km and 8 km/hr for the next 1 km. What is t his average speed for the walk of 2 km?

A heavy ball is suspended from the ceiling of a motor car through a light string. A transverse pulse travels at a speed of 60 cm s^-1 on the string when the car is at rest and 62 cm s^-1 when the car accelerates on a horizontal road. Find the acceleration of the car. Take g = 10 ms^-2

Two trains leave a railway station at the same time. The first train travels due west and the second train due north . The first train travels at a speed of 20 km/ hr and the second train travels at 30 km/ hr. After 2 hours, what is the distance between them ?

A parallel -plate capacitor having plate area 25.0 cm^2 and a separation 2.00 mm between the plates .the capacitor is connected to a battery of 12.0 V.(a)find the charge on the capacitor .(b) the plate separation is decreased to 1.00 mm. Find the extra charge given by the battery to the positive plate.

A block of mass 2.00 kg moving at a speed of 10.0 m/s accelerates at 3.0 m/s^2 for 5.00 s. Compute its final kinetic enegy.

Assuming the petrol burnt (per hour) in driving a motor boat veries as the cube of its velocity, show that the most economical speed when going against the current of c miles per hour is ((3c)/2) miles per hour.