Aball is thrown vertically into the air and when it returns after an interval of 2 seconds, it is caught. which one of the following statements is true if the acceleration due to gravity is 10 m/s/s and air resistance can be neglected?

the acceleration at the top of its flight is 10 m/s/s upwards.

the acceleration at the top of its flight is 0 m/s/s.

the time taken for the descending motion does not equal the time taken for the ascending motion.

the acceleration after it leaves the hand is 10 m/s/s downwards.

Which type of electromagnetic waves are dangerous enough to be used to kill cancerous cells? (a)gamma rays (b)visible light (c)infrared light (d)microwaves

First, launch the video below. you will be asked to use your knowledge of physics to predict the outcome of an experiment. then, close the video window and answer the question at right. you can watch the video again at any point. part a as in the video, we apply a charge +q to the half-shell that carries the electroscope. this time, we also apply a charge –q to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? view available hint(s) as in the video, we apply a charge + to the half-shell that carries the electroscope. this time, we also apply a charge – to the other half-shell. when we bring the two halves together, we observe that the electroscope discharges, just as in the video. what does the electroscope needle do when you separate the two half-shells again? it deflects more than it did at the end of the video. it deflects the same amount as at end of the video. it does not deflect at all. it deflects less than it did at the end of the video. submit

Crowbar of 5 metre is used to lift an object of 800 metre if the effort arm is 200cm calculate the force applied