Question

A) a body is dropped from a height. what are its velocity and displacement at the end of 5s?
B) a stone is thrown up with a velocity of 60 m/s. what are its velocity and displacement at the end of 5s?

Answer 1

A) since, initial velocity(u)=0 m/s
acceleration due to gravity(g) = 10 m/s^2
v(final velocity)=u(initial velocity) + gt
=>v = 0 + 10 * 5
=>v= 50 m/s. ans

b) since, u = 60 m/s
using, v = u - at (because velocity decreases)
=> v = 60 - 10 * 5
=> v = 10 m/s. ans

answer may vary if you change (g) to 9.8 m/s^2