Aball is thrown at an angle upward from a raised platform. it is released from a height of 2.1m above the ground. the ball raises into the air and comes back to land on the ground 4.2s later a horizontal distance of 40.0m away. what is the initial velocity of the ball and the maximum height of the ball above ground?

One hazard of space travel is debris left by previous missions. there are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. calculate the force exerted by a 0.110 mg chip of paint that strikes a space shuttle window at a relative speed of 5.00 ✕ 103 m/s and sticks, given the collision lasts 6.00 ✕ 10-8 s. such a collision chipped the window of the ill-fated challenger in june 1983, causing $50,000 of damage.