IIT PREVIOUS YEAR QUESTION AND SOLUTION, JEE I Physics I Class 11I CBSE I

MOTION IN A STRAIGHT LINE
From a tower of height H, a particle is thrown vertically upwards with a speed u. The time taken by the particle, to hit the ground, is n times that taken by it to reach the highest point of its path. The relation between H, u and n is:

[@truthtracker-q5i]

Sir ,jb ball niche aa rha hai to ....height negative kaise hoga .......height kbhi negative nhi ho sakta

[@physicsnama]

Iss case me hamne height ko ,jis point se ball ko throw kiya gaya hain , waha se download direction me measure kiya hain , iss liye height negative hain.
Thank for query.

[@truthtracker-q5i]

Aur jb free fall ho rha under gravity to g negative kaise hoga

[@physicsnama]

Straight line motion me kisi bhi ek direction ko positive consider kar sakte hain aur uske opposite direction ko negative. Iss case me hamne download direction ko negative consider kiya hain aur upward direction ko positive. Iss liye g ka value negative hain.