Which has the greater acceleration, an airplane, that goes from 1000 km/h to 1005 km/h in 10s or a skateboard that goes from zero to 5km/h in 1 second?

A man travels a certain distance with a uniform speed of 5 km/h ad returns the same distance with a uniform speed of 4km/h. What is the average speed of the man?

In which case will the decreases in the value of the acceleration due to gravity be greater (with respect to that on the earth's surface) -at 1 km above the earth's surface or 1 km below the earth's surface ?

A man travels from Kalighat to Tarakeswar with a uniform speed of u km/h and returns from Tarakeswar to Kalighat with uniform speed of v km/h. Show that his average speed is the harmonic mean between u and v.

A car moves with a uniform velocity of 36 "km.h^(-1) on a straight road Then it attains a uniform acceleration and doubles its velocity in 10s. The radius of a wheel of the car it 25 cm. The number of complete rotations of the wheel in those 10s would be about

Calculate the angular velocity of the earth for which effective acceleration due to gravity at the equator becomes zero. In this condition, what will be the length of the day ? Take R_e =6400 km and g=10 m*s^(-2)

A boy goes to school from his home at a speed of x km/h and comes back at a speed of y km/h, then his average speed is-