Mechanics | Relativity Answers

A young girl gives her toboggan a push of 4.0 m/s up a hill. It slides up the hill slowing down at an acceleration of 8.0 m/s^2 [down]. It comes to a stop and then slides back towards her speeding up at the same rate as it slowed down on the way up. If the girl has to run 48 m down the hill from where it first was pushed to get to where her sled stopped, find the elapsed time for the journey.

body projected at such an angle that horizontal range is 3 times greatest height.find angle of projection

Please mention me the rules of determining significant figures.

Two partical moving in x directions such that u=3i and v=4i.due to gravition force they are coming downward direction.find their distance when both the velocities are perpendicular to each other.

radius of orbit of satellite of earth is R. Its kinetic energy is proportional to what?

For moving particle, the relation between time and position is given by t = Ax^2+Bx. Where A and B
are constants. Find out the acceleration of the particle as a function of velocity.

what are the beneficial and harmful effects of technology to society , environment, and to the students?

A bus is moving at 10ms^-1 towards a traffic light.when the driver sees the light changes to red,the bus is ay a distance of 20m.the reaction tine of the driver us 0.5s and the deceleration is 4.5ms^-2.how far is the bus when it stops?

Two 1.0 g beads are charged equally and placed 5.0 cm apart. When released, they begin to accelerate at 150m/s^2. What is the magnitude of the charge on each bead?

a mass of 10 g moving with a speed of 100 cm/s strikes a pendulum bob of mass 10 g. the two masses stick together. The maximum height reached by the system now is?