Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2m/s, calculate the distance between her house and the school?

Rita takes 20 minutes to cover a distance of 3.2 kilometres on a bicycle . Calculate her speed in units of kilometer/min and metre/min.

A hill is 500 m high. Supplies are to be sent across the hill using a canon that can hurl packets at a speed of 125 m//s over the hill. The canon is located at a distance of 800m from the foot of hill and can be moved on the ground at ba speed of 2 m//s, so that its distance from the hill can be adjusted. What is the shortest time in which a packet can reach on the ground across the hill? Take g= 10 m//s^(2) .

The time between a clap and its echo from a wall is 0.1 s. If the distance of the wall be 17.5 m, calculate the speed of sound.

A 50 kg girl whose leg bones are 5m^2 in area and 50 cm long falls from a height of 2 m without breaking her leg bones.If the bones can stand a stress of 10^8 Nm^(-2) ,calculate the Young's modulus for the material of bones.

Two fixed, equal, positive charges, each of magnitude 5xx10^-5 coul are located at points A and B separated by a distance of 6m. An equal and opposite charge moves towards them along the line COD, the perpendicular bisector of the line AB. The moving charge, when it reaches the point C at a distance of 4m from O, has a kinetic energy of 4 joules. Calculate the distance of the farthest point D which the negative charge will reach before returning towards C.

A point source of gamma - radiatonhas a half-life of 30 minutes.The intitial count rate recorded by Geiger counter placed 2 m from the source is 360 s^(-1) .The distnace between the counter and the source is altered.After 1.5 hours,the count rate recorded is 5 s^(-1) .What is th new distnace between the counter and the source?

Saurabh takes 15 minutes to reach school from his house and Sachin takes one hour to reach school from house.Find the ratio of the time taken by Saurabh to the time tken by Sachin