A particle of mass 1 kg is projected upwards with velocity 60 m/s. Another particle of mass 2 kg is just dropped from a certain height. If, after 2 s, when neither of the particles have collided with ground, the value of the velocity of com (in m/s) is _____

A particle is projected from ground with velocity 40sqrt(2)m//s at 45^(@) . At time t=2s

A particle is projected vertically upwards from ground with velocity 10 m // s. Find the time taken by it to reach at the highest point ?

A particle is projected from ground with velocity 40sqrt2m at 45^(@) .At time t=2s

A particle of mass 2 kg is projected with a velocity (6 hat(i) + 8 hat(j)) m/s. Find the magnitude of change in momentum (in kg m/s) when it just touches ground again.

A particle P is projected upwards with 80m//s . One second later another particle Q is projected with initial velocity 70m//s . Before either of the particle srikes the ground (g=10m//s^(2))

A particle of mass m is projected upwards with velocity v=(v_(e))/(2) , where v_(e) is the escape velocity then at the maximum height the potential energy of the particle is : (R is radius of earth and M is mass of earth)

A body of mass 2 kg is projected upward from the surface of the ground at t = 0 with a velocity of 20 m//s . One second later a body B, also of mass 2 kg , is dropped from a height of 20m . If they collide elastically, then velocities just after collision are :-